Cutis

The Diagnosis: Microcystic Lymphatic Malformation 

The shave biopsy demonstrated numerous thin-walled vascular spaces filled with lymphatic fluid within the dermis (Figure), consistent with a diagnosis of microcystic lymphatic malformation (LM). Lymphatic malformations represent a class of benign vascular lesions consisting of anomalous or dilated lymphatic vessels, which can be broadly categorized as macrocystic (formerly cavernous lymphangioma or cystic hygroma), microcystic (formerly lymphangioma circumscriptum), or mixed.¹ Patients often will present with pruritus, crusting, secondary infection, edema, or oozing.² The superficial blebs of microcystic LMs resemble frog spawn and range in color from clear to pink, brawny, or deep maroon.³ Although the lymphatic vessels involved in microcystic LMs appear disconnected from the major lymphatic circulation,³ systemic fluid overload could plausibly promote lesional swelling and tenderness; we attributed our patient's worsening symptoms to the cumulative ^7.8 L of intravenous fluid he received intraoperatively during his cardiac transplant. The excess fluid allowed communication between lymphatic cisterns and thin-walled vesicles on the skin surface through dilated channels. Overall, LMs represent roughly 26% of pediatric benign vascular tumors and approximately 4% of all vascular tumors.⁴  

Although microcystic LMs may appear especially vascular or verrucous, the differential diagnosis for our patient's LM included condyloma acuminatum,^5,6 condyloma lata,⁷ epidermal nevus, and lymphangiosarcoma. Epidermal nevi are congenital lesions, varying in appearance from velvety to verrucous patches and plaques that often evolve during puberty and become thicker, more verrucous, and hyperpigmented. Keratinocytic epidermal nevus syndromes and other entities such as nevus sebaceous have been associated with somatic mutations affecting proteins in the fibroblast growth factor receptor signaling pathway (eg, FGFR3, HRAS).⁸ Although the clinical appearance alone may be similar, lymphangiosarcoma can be distinguished from LM via biopsy.  

There are several methods to diagnose LM. Duplex sonography is possibly the best noninvasive method to identify the flow between venous valves. Magnetic resonance imaging can detect larger occurrences of LM, and lymphangiography can be utilized to confirm a normal or abnormal lymphatic network.⁴ Treatment options are broad, including surgical excision, laser ablation, and topical sirolimus. Hypertonic saline sclerotherapy can be injected into the afflicted lymphatic channels to decrease inflammation, erythema, and hyperpigmentation without further treatment or major side effects.⁴

However, the benefits of sclerotherapy alone in the treatment of LM often come gradually, and radiofrequency ablation may need to be utilized to achieve more immediate results.² Overall, outcomes are highly variable, but favorable outcomes often can be difficult to obtain due to a high recurrence rate.^2,8 Our patient's symptoms improved during his postoperative recovery, and he declined further intervention.  

The Diagnosis: Microcystic Lymphatic Malformation 

The shave biopsy demonstrated numerous thin-walled vascular spaces filled with lymphatic fluid within the dermis (Figure), consistent with a diagnosis of microcystic lymphatic malformation (LM). Lymphatic malformations represent a class of benign vascular lesions consisting of anomalous or dilated lymphatic vessels, which can be broadly categorized as macrocystic (formerly cavernous lymphangioma or cystic hygroma), microcystic (formerly lymphangioma circumscriptum), or mixed.¹ Patients often will present with pruritus, crusting, secondary infection, edema, or oozing.² The superficial blebs of microcystic LMs resemble frog spawn and range in color from clear to pink, brawny, or deep maroon.³ Although the lymphatic vessels involved in microcystic LMs appear disconnected from the major lymphatic circulation,³ systemic fluid overload could plausibly promote lesional swelling and tenderness; we attributed our patient's worsening symptoms to the cumulative ^7.8 L of intravenous fluid he received intraoperatively during his cardiac transplant. The excess fluid allowed communication between lymphatic cisterns and thin-walled vesicles on the skin surface through dilated channels. Overall, LMs represent roughly 26% of pediatric benign vascular tumors and approximately 4% of all vascular tumors.⁴  

Although microcystic LMs may appear especially vascular or verrucous, the differential diagnosis for our patient's LM included condyloma acuminatum,^5,6 condyloma lata,⁷ epidermal nevus, and lymphangiosarcoma. Epidermal nevi are congenital lesions, varying in appearance from velvety to verrucous patches and plaques that often evolve during puberty and become thicker, more verrucous, and hyperpigmented. Keratinocytic epidermal nevus syndromes and other entities such as nevus sebaceous have been associated with somatic mutations affecting proteins in the fibroblast growth factor receptor signaling pathway (eg, FGFR3, HRAS).⁸ Although the clinical appearance alone may be similar, lymphangiosarcoma can be distinguished from LM via biopsy.  

There are several methods to diagnose LM. Duplex sonography is possibly the best noninvasive method to identify the flow between venous valves. Magnetic resonance imaging can detect larger occurrences of LM, and lymphangiography can be utilized to confirm a normal or abnormal lymphatic network.⁴ Treatment options are broad, including surgical excision, laser ablation, and topical sirolimus. Hypertonic saline sclerotherapy can be injected into the afflicted lymphatic channels to decrease inflammation, erythema, and hyperpigmentation without further treatment or major side effects.⁴

However, the benefits of sclerotherapy alone in the treatment of LM often come gradually, and radiofrequency ablation may need to be utilized to achieve more immediate results.² Overall, outcomes are highly variable, but favorable outcomes often can be difficult to obtain due to a high recurrence rate.^2,8 Our patient's symptoms improved during his postoperative recovery, and he declined further intervention.  

The Diagnosis: Microcystic Lymphatic Malformation 

The shave biopsy demonstrated numerous thin-walled vascular spaces filled with lymphatic fluid within the dermis (Figure), consistent with a diagnosis of microcystic lymphatic malformation (LM). Lymphatic malformations represent a class of benign vascular lesions consisting of anomalous or dilated lymphatic vessels, which can be broadly categorized as macrocystic (formerly cavernous lymphangioma or cystic hygroma), microcystic (formerly lymphangioma circumscriptum), or mixed.¹ Patients often will present with pruritus, crusting, secondary infection, edema, or oozing.² The superficial blebs of microcystic LMs resemble frog spawn and range in color from clear to pink, brawny, or deep maroon.³ Although the lymphatic vessels involved in microcystic LMs appear disconnected from the major lymphatic circulation,³ systemic fluid overload could plausibly promote lesional swelling and tenderness; we attributed our patient's worsening symptoms to the cumulative ^7.8 L of intravenous fluid he received intraoperatively during his cardiac transplant. The excess fluid allowed communication between lymphatic cisterns and thin-walled vesicles on the skin surface through dilated channels. Overall, LMs represent roughly 26% of pediatric benign vascular tumors and approximately 4% of all vascular tumors.⁴  

Although microcystic LMs may appear especially vascular or verrucous, the differential diagnosis for our patient's LM included condyloma acuminatum,^5,6 condyloma lata,⁷ epidermal nevus, and lymphangiosarcoma. Epidermal nevi are congenital lesions, varying in appearance from velvety to verrucous patches and plaques that often evolve during puberty and become thicker, more verrucous, and hyperpigmented. Keratinocytic epidermal nevus syndromes and other entities such as nevus sebaceous have been associated with somatic mutations affecting proteins in the fibroblast growth factor receptor signaling pathway (eg, FGFR3, HRAS).⁸ Although the clinical appearance alone may be similar, lymphangiosarcoma can be distinguished from LM via biopsy.  

There are several methods to diagnose LM. Duplex sonography is possibly the best noninvasive method to identify the flow between venous valves. Magnetic resonance imaging can detect larger occurrences of LM, and lymphangiography can be utilized to confirm a normal or abnormal lymphatic network.⁴ Treatment options are broad, including surgical excision, laser ablation, and topical sirolimus. Hypertonic saline sclerotherapy can be injected into the afflicted lymphatic channels to decrease inflammation, erythema, and hyperpigmentation without further treatment or major side effects.⁴

However, the benefits of sclerotherapy alone in the treatment of LM often come gradually, and radiofrequency ablation may need to be utilized to achieve more immediate results.² Overall, outcomes are highly variable, but favorable outcomes often can be difficult to obtain due to a high recurrence rate.^2,8 Our patient's symptoms improved during his postoperative recovery, and he declined further intervention.  

Plasma cell cheilitis (PCC), also known as plasmocytosis circumorificialis and plasmocytosis mucosae,¹ is a poorly understood, uncommon inflammatory condition characterized by dense infiltration of mature plasma cells in the mucosal dermis of the lip.^2-5 The etiology of PCC is unknown but is thought to be a reactive immune process triggered by infection, mechanical friction, trauma, or solar damage.^1,5,6

The most common presentation of PCC is a slowly evolving, red-brown patch or plaque on the lower lip in older individuals.^2,3,5,7 Secondary changes with disease progression can include erosion, ulceration, fissures, edema, bleeding, or crusting.⁵ The diagnosis of PCC is challenging because it can mimic neoplastic, infectious, and inflammatory conditions.^8,9

Treatment strategies for PCC described in the literature vary, as does therapeutic response. Resolution of PCC has been documented after systemic steroids, intralesional steroids, systemic griseofulvin, and topical calcineurin inhibitors, among other agents.^6,7,10-16

We present the case of a patient with a lip lesion who ultimately was diagnosed with PCC after it progressed to an advanced necrotic stage.

Case Report

An 80-year-old male veteran of the Armed Services initially presented to our institution via teledermatology with redness and crusting of the lower lip (Figure 1). He had a history of myelodysplastic syndrome and anemia requiring iron transfusion. The process appeared to be consistent with actinic cheilitis vs squamous cell carcinoma. In-person dermatology consultation was recommended; however, the patient did not follow through with that appointment.

Five months later, additional photographs of the lesion were taken by the patient's primary care physician and sent through teledermatology, revealing progression to an erythematous, yellow-crusted erosion (Figure 2). The medical record indicated that a punch biopsy performed by the patient’s primary care physician showed hyperkeratosis and fungal organisms on periodic acid–Schiff staining. He subsequently applied ketoconazole and terbinafine cream to the lower lip without improvement. Prompt in-person evaluation by dermatology was again recommended.

Comment

The diagnosis and management of PCC is difficult because the condition is uncommon (though its true incidence is unknown) and the presentation is nonspecific, invoking a wide differential diagnosis. In the literature, PCC presents as a slowly progressive, red-brown patch or plaque on the lower lip in older individuals.^2,3,5,7 The lesion can progress to become eroded, ulcerated, fissured, or edematous.⁵

Differential Diagnosis
The clinical differential diagnosis of PCC is broad and includes inflammatory, infectious, and neoplastic causes, such as actinic cheilitis, allergic contact cheilitis, exfoliative cheilitis, granulomatous cheilitis, lichen planus, candidiasis, syphilis, and squamous cell carcinoma of the lip.^7,9 The histologic differential diagnosis includes allergic contact cheilitis, secondary syphilis, actinic cheilitis, squamous cell carcinoma, cheilitis granulomatosa, and plasmacytoma.^17-19

Histopathology
On biopsy, PCC usually is characterized by plasma cells in a bandlike pattern in the upper submucosa or even more diffusely throughout the submucosa.²⁰ In earlier studies, polyclonality of plasma cells with kappa and lambda light chains has been demonstrated⁵; in this case, such polyclonality militated against a plasma cell dyscrasia. There have been reports of a various number of eosinophils in PCC,^5,20 but eosinophils were not a prominent feature in our case.

Treatment
As reported in the literature, treatment of PCC has been attempted using a broad range of strategies; however, the optimal regimen has yet to be elucidated.¹⁵ Numerous therapies, including excision, radiation, electrocauterization, cryotherapy, steroids, systemic griseofulvin, topical fusidic acid, and topical calcineurin inhibitors, have yielded variable success.^6,7,10-16

The success of topical corticosteroids, as demonstrated in our case, has been unpredictable; the reported response has ranged from complete resolution to failure.⁹ This variability is thought to be related to epithelial width and the degree of acanthosis, with ulcerative lesions demonstrating a superior response to topical corticosteroids.⁹

Conclusion

Our case highlights the challenges of diagnosing and managing PCC, especially through teledermatology. Initial photographs of the lesion (Figure 1) that were submitted demonstrated a nonspecific erosion, which was concerning for any of several infectious, inflammatory, and malignant causes. Prompt in-person evaluation was warranted; regrettably, the patient’s condition worsened rapidly in the 10 days it took for him to be seen in-person by dermatology.

Furthermore, this case necessitated 3 separate biopsies because the pathology on the first 2 biopsies initially was equivocal, demonstrating ulceration and granulation tissue. The diagnosis was finally made after a third biopsy was recommended by a dermatopathologist, who eventually identified a bandlike distribution of polyclonal plasma cells in the upper submucosa, consistent with a diagnosis of PCC. Our patient’s final disease presentation (Figure 3) was exuberant and may represent the end point of untreated PCC.

Plasma cell cheilitis (PCC), also known as plasmocytosis circumorificialis and plasmocytosis mucosae,¹ is a poorly understood, uncommon inflammatory condition characterized by dense infiltration of mature plasma cells in the mucosal dermis of the lip.^2-5 The etiology of PCC is unknown but is thought to be a reactive immune process triggered by infection, mechanical friction, trauma, or solar damage.^1,5,6

The most common presentation of PCC is a slowly evolving, red-brown patch or plaque on the lower lip in older individuals.^2,3,5,7 Secondary changes with disease progression can include erosion, ulceration, fissures, edema, bleeding, or crusting.⁵ The diagnosis of PCC is challenging because it can mimic neoplastic, infectious, and inflammatory conditions.^8,9

Treatment strategies for PCC described in the literature vary, as does therapeutic response. Resolution of PCC has been documented after systemic steroids, intralesional steroids, systemic griseofulvin, and topical calcineurin inhibitors, among other agents.^6,7,10-16

We present the case of a patient with a lip lesion who ultimately was diagnosed with PCC after it progressed to an advanced necrotic stage.

Case Report

An 80-year-old male veteran of the Armed Services initially presented to our institution via teledermatology with redness and crusting of the lower lip (Figure 1). He had a history of myelodysplastic syndrome and anemia requiring iron transfusion. The process appeared to be consistent with actinic cheilitis vs squamous cell carcinoma. In-person dermatology consultation was recommended; however, the patient did not follow through with that appointment.

Five months later, additional photographs of the lesion were taken by the patient's primary care physician and sent through teledermatology, revealing progression to an erythematous, yellow-crusted erosion (Figure 2). The medical record indicated that a punch biopsy performed by the patient’s primary care physician showed hyperkeratosis and fungal organisms on periodic acid–Schiff staining. He subsequently applied ketoconazole and terbinafine cream to the lower lip without improvement. Prompt in-person evaluation by dermatology was again recommended.

Comment

The diagnosis and management of PCC is difficult because the condition is uncommon (though its true incidence is unknown) and the presentation is nonspecific, invoking a wide differential diagnosis. In the literature, PCC presents as a slowly progressive, red-brown patch or plaque on the lower lip in older individuals.^2,3,5,7 The lesion can progress to become eroded, ulcerated, fissured, or edematous.⁵

Differential Diagnosis
The clinical differential diagnosis of PCC is broad and includes inflammatory, infectious, and neoplastic causes, such as actinic cheilitis, allergic contact cheilitis, exfoliative cheilitis, granulomatous cheilitis, lichen planus, candidiasis, syphilis, and squamous cell carcinoma of the lip.^7,9 The histologic differential diagnosis includes allergic contact cheilitis, secondary syphilis, actinic cheilitis, squamous cell carcinoma, cheilitis granulomatosa, and plasmacytoma.^17-19

Histopathology
On biopsy, PCC usually is characterized by plasma cells in a bandlike pattern in the upper submucosa or even more diffusely throughout the submucosa.²⁰ In earlier studies, polyclonality of plasma cells with kappa and lambda light chains has been demonstrated⁵; in this case, such polyclonality militated against a plasma cell dyscrasia. There have been reports of a various number of eosinophils in PCC,^5,20 but eosinophils were not a prominent feature in our case.

Treatment
As reported in the literature, treatment of PCC has been attempted using a broad range of strategies; however, the optimal regimen has yet to be elucidated.¹⁵ Numerous therapies, including excision, radiation, electrocauterization, cryotherapy, steroids, systemic griseofulvin, topical fusidic acid, and topical calcineurin inhibitors, have yielded variable success.^6,7,10-16

The success of topical corticosteroids, as demonstrated in our case, has been unpredictable; the reported response has ranged from complete resolution to failure.⁹ This variability is thought to be related to epithelial width and the degree of acanthosis, with ulcerative lesions demonstrating a superior response to topical corticosteroids.⁹

Conclusion

Our case highlights the challenges of diagnosing and managing PCC, especially through teledermatology. Initial photographs of the lesion (Figure 1) that were submitted demonstrated a nonspecific erosion, which was concerning for any of several infectious, inflammatory, and malignant causes. Prompt in-person evaluation was warranted; regrettably, the patient’s condition worsened rapidly in the 10 days it took for him to be seen in-person by dermatology.

Furthermore, this case necessitated 3 separate biopsies because the pathology on the first 2 biopsies initially was equivocal, demonstrating ulceration and granulation tissue. The diagnosis was finally made after a third biopsy was recommended by a dermatopathologist, who eventually identified a bandlike distribution of polyclonal plasma cells in the upper submucosa, consistent with a diagnosis of PCC. Our patient’s final disease presentation (Figure 3) was exuberant and may represent the end point of untreated PCC.

Plasma cell cheilitis (PCC), also known as plasmocytosis circumorificialis and plasmocytosis mucosae,¹ is a poorly understood, uncommon inflammatory condition characterized by dense infiltration of mature plasma cells in the mucosal dermis of the lip.^2-5 The etiology of PCC is unknown but is thought to be a reactive immune process triggered by infection, mechanical friction, trauma, or solar damage.^1,5,6

The most common presentation of PCC is a slowly evolving, red-brown patch or plaque on the lower lip in older individuals.^2,3,5,7 Secondary changes with disease progression can include erosion, ulceration, fissures, edema, bleeding, or crusting.⁵ The diagnosis of PCC is challenging because it can mimic neoplastic, infectious, and inflammatory conditions.^8,9

Treatment strategies for PCC described in the literature vary, as does therapeutic response. Resolution of PCC has been documented after systemic steroids, intralesional steroids, systemic griseofulvin, and topical calcineurin inhibitors, among other agents.^6,7,10-16

We present the case of a patient with a lip lesion who ultimately was diagnosed with PCC after it progressed to an advanced necrotic stage.

Case Report

An 80-year-old male veteran of the Armed Services initially presented to our institution via teledermatology with redness and crusting of the lower lip (Figure 1). He had a history of myelodysplastic syndrome and anemia requiring iron transfusion. The process appeared to be consistent with actinic cheilitis vs squamous cell carcinoma. In-person dermatology consultation was recommended; however, the patient did not follow through with that appointment.

Five months later, additional photographs of the lesion were taken by the patient's primary care physician and sent through teledermatology, revealing progression to an erythematous, yellow-crusted erosion (Figure 2). The medical record indicated that a punch biopsy performed by the patient’s primary care physician showed hyperkeratosis and fungal organisms on periodic acid–Schiff staining. He subsequently applied ketoconazole and terbinafine cream to the lower lip without improvement. Prompt in-person evaluation by dermatology was again recommended.

Comment

The diagnosis and management of PCC is difficult because the condition is uncommon (though its true incidence is unknown) and the presentation is nonspecific, invoking a wide differential diagnosis. In the literature, PCC presents as a slowly progressive, red-brown patch or plaque on the lower lip in older individuals.^2,3,5,7 The lesion can progress to become eroded, ulcerated, fissured, or edematous.⁵

Differential Diagnosis
The clinical differential diagnosis of PCC is broad and includes inflammatory, infectious, and neoplastic causes, such as actinic cheilitis, allergic contact cheilitis, exfoliative cheilitis, granulomatous cheilitis, lichen planus, candidiasis, syphilis, and squamous cell carcinoma of the lip.^7,9 The histologic differential diagnosis includes allergic contact cheilitis, secondary syphilis, actinic cheilitis, squamous cell carcinoma, cheilitis granulomatosa, and plasmacytoma.^17-19

Histopathology
On biopsy, PCC usually is characterized by plasma cells in a bandlike pattern in the upper submucosa or even more diffusely throughout the submucosa.²⁰ In earlier studies, polyclonality of plasma cells with kappa and lambda light chains has been demonstrated⁵; in this case, such polyclonality militated against a plasma cell dyscrasia. There have been reports of a various number of eosinophils in PCC,^5,20 but eosinophils were not a prominent feature in our case.

Treatment
As reported in the literature, treatment of PCC has been attempted using a broad range of strategies; however, the optimal regimen has yet to be elucidated.¹⁵ Numerous therapies, including excision, radiation, electrocauterization, cryotherapy, steroids, systemic griseofulvin, topical fusidic acid, and topical calcineurin inhibitors, have yielded variable success.^6,7,10-16

The success of topical corticosteroids, as demonstrated in our case, has been unpredictable; the reported response has ranged from complete resolution to failure.⁹ This variability is thought to be related to epithelial width and the degree of acanthosis, with ulcerative lesions demonstrating a superior response to topical corticosteroids.⁹

Conclusion

Our case highlights the challenges of diagnosing and managing PCC, especially through teledermatology. Initial photographs of the lesion (Figure 1) that were submitted demonstrated a nonspecific erosion, which was concerning for any of several infectious, inflammatory, and malignant causes. Prompt in-person evaluation was warranted; regrettably, the patient’s condition worsened rapidly in the 10 days it took for him to be seen in-person by dermatology.

Furthermore, this case necessitated 3 separate biopsies because the pathology on the first 2 biopsies initially was equivocal, demonstrating ulceration and granulation tissue. The diagnosis was finally made after a third biopsy was recommended by a dermatopathologist, who eventually identified a bandlike distribution of polyclonal plasma cells in the upper submucosa, consistent with a diagnosis of PCC. Our patient’s final disease presentation (Figure 3) was exuberant and may represent the end point of untreated PCC.

To the Editor:

The art of tattooing continues to gain popularity in the 21st century, albeit with accompanying hazards.¹ Reported adverse reactions to tattoos include infections, tumors, and hypersensitivity and granulomatous reactions.² Various infectious agents may involve tattoos, including human papillomavirus (HPV), molluscum contagiosum, herpes simplex virus, hepatitis C virus, tuberculoid and nontuberculoid mycobacteria, and Staphylococcus aureus.² Verruca vulgaris infrequently has been reported to develop in tattoos.^3,4 Previously reported cases of verruca in tattoos suggest a predilection for blue or black pigment.^1-5 We report a case of verruca vulgaris occurring within the red-inked areas of a tattoo that first appeared approximately 18 years after the initial tattoo placement.

A 44-year-old woman presented with erythema, induration, and irritation of a tattoo on the left leg of 2 years’ duration. The tattoo initially was inscribed more than 20 years prior. The patient had a history of type 2 diabetes mellitus and chronic obstructive pulmonary disease. She reported no prior trauma to the area, prior rash or irritation, or similar changes to her other tattoos, including those with red ink. The affected tattoo was inscribed at a separate time from the other tattoos. Physical examination of the irritated tattoo revealed hyperkeratotic papules with firm scaling in the zone of dermal red pigment (Figure 1). Notable nodularity or deep induration was not present. The clinical differential diagnosis included a hypersensitivity reaction to red tattoo ink, sarcoidosis, and an infectious process, such as an atypical mycobacterial infection. A punch biopsy demonstrated papillomatous epidermal hyperplasia with hyperkeratosis, focal parakeratosis, and frequent vacuolization of keratinocytes with enlarged keratohyalin granules, diagnostic of verruca vulgaris (Figure 2). Of note, the patient did not have clinically apparent viral warts elsewhere on physical examination. The patient was successfully managedwith a combination of 2 treatments of intralesional Candida antigen and 3 treatments of cryotherapy with resolution of most lesions over the course of 8 months. Over the following several months, the patient applied topical salicylic acid, which led to the resolution of the remaining lesions. The verrucae had not recurred 19 months after the initial presentation.

The development of verruca vulgaris within a tattoo may occur secondary to various mechanisms of HPV inoculation, including introduction of the virus through contaminated ink, the tattoo artist’s saliva, autoinoculation, or koebnerization of a pre-existing verruca vulgaris.⁴ Local immune system dysregulation secondary to tattoo ink also has been proposed as a mechanism for HPV infection in this setting.^1,5 The contents of darker tattoo pigments may promote formation of reactive oxygen species inducing local immunocompromise.⁵

The pathogenic mechanism was elusive in our patient. Although the localization of verruca vulgaris to the zones of red pigment may be merely coincidental, this phenomenon raised suspicion for direct inoculation via contaminated red ink. The patient’s other red ink–containing tattoos that were inscribed separately were spared, compatible with contamination of the red ink used for the affected tattoo. However, the delayed onset of nearly 2 decades was exceptional, given the shorter previously reported latencies ranging from months to 10 years.⁴ Autoinoculation or koebnerization is plausible, though greater involvement of nonred pigments would be expected as well as a briefer latency. Finally, the possibility of local immune dysregulation seemed feasible, given the slow evolution of the lesions largely restricted to one pigment type.

We report a case of verruca vulgaris within the red area of a multicolored tattoo that occurred approximately 18 years after tattoo placement. This case highlights a rare presentation of an infectious agent that may complicate tattoos. Both predilection for red pigment rather than black or blue pigment and the long latency period raised interesting questions regarding pathogenesis. Confirmatory biopsy enables effective management of this tattoo complication.

To the Editor:

The art of tattooing continues to gain popularity in the 21st century, albeit with accompanying hazards.¹ Reported adverse reactions to tattoos include infections, tumors, and hypersensitivity and granulomatous reactions.² Various infectious agents may involve tattoos, including human papillomavirus (HPV), molluscum contagiosum, herpes simplex virus, hepatitis C virus, tuberculoid and nontuberculoid mycobacteria, and Staphylococcus aureus.² Verruca vulgaris infrequently has been reported to develop in tattoos.^3,4 Previously reported cases of verruca in tattoos suggest a predilection for blue or black pigment.^1-5 We report a case of verruca vulgaris occurring within the red-inked areas of a tattoo that first appeared approximately 18 years after the initial tattoo placement.

A 44-year-old woman presented with erythema, induration, and irritation of a tattoo on the left leg of 2 years’ duration. The tattoo initially was inscribed more than 20 years prior. The patient had a history of type 2 diabetes mellitus and chronic obstructive pulmonary disease. She reported no prior trauma to the area, prior rash or irritation, or similar changes to her other tattoos, including those with red ink. The affected tattoo was inscribed at a separate time from the other tattoos. Physical examination of the irritated tattoo revealed hyperkeratotic papules with firm scaling in the zone of dermal red pigment (Figure 1). Notable nodularity or deep induration was not present. The clinical differential diagnosis included a hypersensitivity reaction to red tattoo ink, sarcoidosis, and an infectious process, such as an atypical mycobacterial infection. A punch biopsy demonstrated papillomatous epidermal hyperplasia with hyperkeratosis, focal parakeratosis, and frequent vacuolization of keratinocytes with enlarged keratohyalin granules, diagnostic of verruca vulgaris (Figure 2). Of note, the patient did not have clinically apparent viral warts elsewhere on physical examination. The patient was successfully managedwith a combination of 2 treatments of intralesional Candida antigen and 3 treatments of cryotherapy with resolution of most lesions over the course of 8 months. Over the following several months, the patient applied topical salicylic acid, which led to the resolution of the remaining lesions. The verrucae had not recurred 19 months after the initial presentation.

The development of verruca vulgaris within a tattoo may occur secondary to various mechanisms of HPV inoculation, including introduction of the virus through contaminated ink, the tattoo artist’s saliva, autoinoculation, or koebnerization of a pre-existing verruca vulgaris.⁴ Local immune system dysregulation secondary to tattoo ink also has been proposed as a mechanism for HPV infection in this setting.^1,5 The contents of darker tattoo pigments may promote formation of reactive oxygen species inducing local immunocompromise.⁵

The pathogenic mechanism was elusive in our patient. Although the localization of verruca vulgaris to the zones of red pigment may be merely coincidental, this phenomenon raised suspicion for direct inoculation via contaminated red ink. The patient’s other red ink–containing tattoos that were inscribed separately were spared, compatible with contamination of the red ink used for the affected tattoo. However, the delayed onset of nearly 2 decades was exceptional, given the shorter previously reported latencies ranging from months to 10 years.⁴ Autoinoculation or koebnerization is plausible, though greater involvement of nonred pigments would be expected as well as a briefer latency. Finally, the possibility of local immune dysregulation seemed feasible, given the slow evolution of the lesions largely restricted to one pigment type.

We report a case of verruca vulgaris within the red area of a multicolored tattoo that occurred approximately 18 years after tattoo placement. This case highlights a rare presentation of an infectious agent that may complicate tattoos. Both predilection for red pigment rather than black or blue pigment and the long latency period raised interesting questions regarding pathogenesis. Confirmatory biopsy enables effective management of this tattoo complication.

To the Editor:

The art of tattooing continues to gain popularity in the 21st century, albeit with accompanying hazards.¹ Reported adverse reactions to tattoos include infections, tumors, and hypersensitivity and granulomatous reactions.² Various infectious agents may involve tattoos, including human papillomavirus (HPV), molluscum contagiosum, herpes simplex virus, hepatitis C virus, tuberculoid and nontuberculoid mycobacteria, and Staphylococcus aureus.² Verruca vulgaris infrequently has been reported to develop in tattoos.^3,4 Previously reported cases of verruca in tattoos suggest a predilection for blue or black pigment.^1-5 We report a case of verruca vulgaris occurring within the red-inked areas of a tattoo that first appeared approximately 18 years after the initial tattoo placement.

A 44-year-old woman presented with erythema, induration, and irritation of a tattoo on the left leg of 2 years’ duration. The tattoo initially was inscribed more than 20 years prior. The patient had a history of type 2 diabetes mellitus and chronic obstructive pulmonary disease. She reported no prior trauma to the area, prior rash or irritation, or similar changes to her other tattoos, including those with red ink. The affected tattoo was inscribed at a separate time from the other tattoos. Physical examination of the irritated tattoo revealed hyperkeratotic papules with firm scaling in the zone of dermal red pigment (Figure 1). Notable nodularity or deep induration was not present. The clinical differential diagnosis included a hypersensitivity reaction to red tattoo ink, sarcoidosis, and an infectious process, such as an atypical mycobacterial infection. A punch biopsy demonstrated papillomatous epidermal hyperplasia with hyperkeratosis, focal parakeratosis, and frequent vacuolization of keratinocytes with enlarged keratohyalin granules, diagnostic of verruca vulgaris (Figure 2). Of note, the patient did not have clinically apparent viral warts elsewhere on physical examination. The patient was successfully managedwith a combination of 2 treatments of intralesional Candida antigen and 3 treatments of cryotherapy with resolution of most lesions over the course of 8 months. Over the following several months, the patient applied topical salicylic acid, which led to the resolution of the remaining lesions. The verrucae had not recurred 19 months after the initial presentation.

The development of verruca vulgaris within a tattoo may occur secondary to various mechanisms of HPV inoculation, including introduction of the virus through contaminated ink, the tattoo artist’s saliva, autoinoculation, or koebnerization of a pre-existing verruca vulgaris.⁴ Local immune system dysregulation secondary to tattoo ink also has been proposed as a mechanism for HPV infection in this setting.^1,5 The contents of darker tattoo pigments may promote formation of reactive oxygen species inducing local immunocompromise.⁵

The pathogenic mechanism was elusive in our patient. Although the localization of verruca vulgaris to the zones of red pigment may be merely coincidental, this phenomenon raised suspicion for direct inoculation via contaminated red ink. The patient’s other red ink–containing tattoos that were inscribed separately were spared, compatible with contamination of the red ink used for the affected tattoo. However, the delayed onset of nearly 2 decades was exceptional, given the shorter previously reported latencies ranging from months to 10 years.⁴ Autoinoculation or koebnerization is plausible, though greater involvement of nonred pigments would be expected as well as a briefer latency. Finally, the possibility of local immune dysregulation seemed feasible, given the slow evolution of the lesions largely restricted to one pigment type.

We report a case of verruca vulgaris within the red area of a multicolored tattoo that occurred approximately 18 years after tattoo placement. This case highlights a rare presentation of an infectious agent that may complicate tattoos. Both predilection for red pigment rather than black or blue pigment and the long latency period raised interesting questions regarding pathogenesis. Confirmatory biopsy enables effective management of this tattoo complication.

To the Editor:

Lupus erythematosus panniculitis (LEP) is rare in the pediatric population. It can be difficult to manage, as patients may not respond to conventional treatments including hydroxychloroquine and prednisone. We report the use of rituximab in the treatment of a 20-year-old woman with LEP of the face, legs, and arms that was refractory to standard treatments. She also had a history of hemophagocytic lymphohistiocytosis (HLH). Further studies are warranted to determine the role of rituximab in the treatment of pediatric patients with LEP.

A 20-year-old woman with history of LEP and HLH initially presented with migratory violaceous nodules on the face 16 years prior to the current presentation. A skin biopsy 3 years after that initial presentation suggested a diagnosis of cutaneous lupus erythematosus. Six years later, numerous asymptomatic lesions appeared on the legs, predominantly on the calves; she was successfully treated with hydroxychloroquine and high-dose prednisone. Four years prior to the current presentation, a febrile illness prompted discontinuation of hydroxychloroquine and hospitalization, where she was first was diagnosed with HLH; she achieved remission with cyclosporine. At the current presentation, she continued to have persistent violaceous lesions on the face, lower arms, and legs with underlying nodularity (Figure 1). Skin biopsies revealed LEP and were less suggestive of HLH. She was restarted on hydroxychloroquine, which did not adequately control the disease. Rheumatologic workup was only notable for an antinuclear antibody titer of 1:80 (reference range, <1:80) in a speckled pattern.

Rituximab, a chimeric monoclonal antibody targeting B-cell surface marker CD20, results in depletion of mature B cells. Use of rituximab for LEP has been described in multiple case reports involving an 8-year-old boy, 22-year-old girl, and 2 middle-aged women.^2-4 In addition, a recently published case series of 4 patients with childhood-onset refractory LEP described improvement of disease activity with rituximab.⁵ It is important to rule out subcutaneous T-cell lymphoma before treatment with rituximab, as its histopathology can closely resemble that seen in LEP and HLH-associated cytophagic histiocytic panniculitis.^1,6

Rituximab may be an effective treatment option in pediatric patients with refractory LEP. Larger studies on the use of rituximab in the pediatric population are necessary.

To the Editor:

Lupus erythematosus panniculitis (LEP) is rare in the pediatric population. It can be difficult to manage, as patients may not respond to conventional treatments including hydroxychloroquine and prednisone. We report the use of rituximab in the treatment of a 20-year-old woman with LEP of the face, legs, and arms that was refractory to standard treatments. She also had a history of hemophagocytic lymphohistiocytosis (HLH). Further studies are warranted to determine the role of rituximab in the treatment of pediatric patients with LEP.

A 20-year-old woman with history of LEP and HLH initially presented with migratory violaceous nodules on the face 16 years prior to the current presentation. A skin biopsy 3 years after that initial presentation suggested a diagnosis of cutaneous lupus erythematosus. Six years later, numerous asymptomatic lesions appeared on the legs, predominantly on the calves; she was successfully treated with hydroxychloroquine and high-dose prednisone. Four years prior to the current presentation, a febrile illness prompted discontinuation of hydroxychloroquine and hospitalization, where she was first was diagnosed with HLH; she achieved remission with cyclosporine. At the current presentation, she continued to have persistent violaceous lesions on the face, lower arms, and legs with underlying nodularity (Figure 1). Skin biopsies revealed LEP and were less suggestive of HLH. She was restarted on hydroxychloroquine, which did not adequately control the disease. Rheumatologic workup was only notable for an antinuclear antibody titer of 1:80 (reference range, <1:80) in a speckled pattern.

Rituximab, a chimeric monoclonal antibody targeting B-cell surface marker CD20, results in depletion of mature B cells. Use of rituximab for LEP has been described in multiple case reports involving an 8-year-old boy, 22-year-old girl, and 2 middle-aged women.^2-4 In addition, a recently published case series of 4 patients with childhood-onset refractory LEP described improvement of disease activity with rituximab.⁵ It is important to rule out subcutaneous T-cell lymphoma before treatment with rituximab, as its histopathology can closely resemble that seen in LEP and HLH-associated cytophagic histiocytic panniculitis.^1,6

Rituximab may be an effective treatment option in pediatric patients with refractory LEP. Larger studies on the use of rituximab in the pediatric population are necessary.

To the Editor:

Lupus erythematosus panniculitis (LEP) is rare in the pediatric population. It can be difficult to manage, as patients may not respond to conventional treatments including hydroxychloroquine and prednisone. We report the use of rituximab in the treatment of a 20-year-old woman with LEP of the face, legs, and arms that was refractory to standard treatments. She also had a history of hemophagocytic lymphohistiocytosis (HLH). Further studies are warranted to determine the role of rituximab in the treatment of pediatric patients with LEP.

A 20-year-old woman with history of LEP and HLH initially presented with migratory violaceous nodules on the face 16 years prior to the current presentation. A skin biopsy 3 years after that initial presentation suggested a diagnosis of cutaneous lupus erythematosus. Six years later, numerous asymptomatic lesions appeared on the legs, predominantly on the calves; she was successfully treated with hydroxychloroquine and high-dose prednisone. Four years prior to the current presentation, a febrile illness prompted discontinuation of hydroxychloroquine and hospitalization, where she was first was diagnosed with HLH; she achieved remission with cyclosporine. At the current presentation, she continued to have persistent violaceous lesions on the face, lower arms, and legs with underlying nodularity (Figure 1). Skin biopsies revealed LEP and were less suggestive of HLH. She was restarted on hydroxychloroquine, which did not adequately control the disease. Rheumatologic workup was only notable for an antinuclear antibody titer of 1:80 (reference range, <1:80) in a speckled pattern.

Rituximab, a chimeric monoclonal antibody targeting B-cell surface marker CD20, results in depletion of mature B cells. Use of rituximab for LEP has been described in multiple case reports involving an 8-year-old boy, 22-year-old girl, and 2 middle-aged women.^2-4 In addition, a recently published case series of 4 patients with childhood-onset refractory LEP described improvement of disease activity with rituximab.⁵ It is important to rule out subcutaneous T-cell lymphoma before treatment with rituximab, as its histopathology can closely resemble that seen in LEP and HLH-associated cytophagic histiocytic panniculitis.^1,6

Rituximab may be an effective treatment option in pediatric patients with refractory LEP. Larger studies on the use of rituximab in the pediatric population are necessary.

The adage “so much to do, so little time” aptly describes the daily challenges facing dermatologists and dermatology residents. The time and attention required by direct patient care, writing notes, navigating electronic health records, and engaging in education and research as well as family commitments can drain even the most tireless clinician. In addition, dermatologists are expected to play a critical role in clinic and practice management to successfully curate an online presence and adapt their skills to successfully manage a teledermatology practice. Coupled with the time spent socializing with friends or colleagues and time for personal hobbies or exercise, it’s easy to see how sleep deprivation is common in many of our colleagues.

What’s being left out of these jam-packed schedules? Increasingly, it is the time and expertise dedicated to volunteering in our local communities. Two recent research letters highlighted how a dramatic increase in the number of research projects and publications is not mirrored by a similar increase in volunteer experiences as dermatology residency selection becomes more competitive.^1,2

Although the rate of volunteerism among practicing dermatologists has yet to be studied, a brief review suggests a component of unmet dermatology need within our communities. It’s estimated that approximately 5% to 10% of all emergency department visits are for dermatologic concerns.^3-5 In many cases, the reason for the visit is nonurgent and instead reflects a lack of other options for care. However, the need for dermatologists extends beyond the emergency department setting. A review of the prevalence of patients presenting for care to a group of regional free clinics found that 8% (N=5553) of all visitors sought care for dermatologic concerns.⁶ The benefit is not just for those seated on the examination table; research has shown that while many of the underlying factors resulting in physician burnout stem from systemic issues, participating in volunteer opportunities helps combat burnout in ourselves and our colleagues.^7-9 Herein, opportunities that exist for dermatologists to reconnect with their communities, advocate for causes distinctive to the specialty, and care for neighbors most in need are highlighted.

Camp Wonder

Every year, children from across the United States living with chronic and debilitating skin conditions get the opportunity to join fellow campers and spend a week just being kids without the constant focus on being a patient. Camp Wonder’s founder and director, Francesca Tenconi, describes the camp as a place where kids “can form a community and can feel free to be themselves, without judgment, without stares. They get the chance to forget about their skin disease and be themselves” (oral communication, June 18, 2021). Tenconi and the camp’s cofounders and medical directors, Drs. Jenny Kim and Stefani Takahashi, envisioned the camp as a place for all campers regardless of their skin condition to feel safe and welcome. This overall mission guides camp leadership and staff every year over the course of the camp week where campers participate in a mix of traditional and nontraditional summer activities that are safe and accessible for all, from spending time in the pool to arts and crafts and a ropes course.

Camp Wonder is in its 21st year of hosting children and adolescents from across North America at its camp in Livermore, California. This year, Tenconi expects about 100 campers during the last week in July. Camp Wonder relies on medical staff volunteers to make the camp setting safe, inclusive, and fun. “Our dermatology residents and dermatology volunteers are a huge part of why we’re able to have camp,” said Tenconi. “A lot of our kids require very specific medical care throughout the week. We are able to provide this camp experience for them because we have this medical support system available, this specialized dermatology knowledge.” She also noted the benefit to the volunteers themselves, saying,“The feedback we get a lot from residents and dermatologists is that camp gave them a chance to understand the true-life impact of some of the skin diseases these kids and families are living with. Kids will open up to them and tell them how their disease has impacted them personally” (oral communication, June 18, 2021).

Volunteer medical providers help manage the medical needs of the campers beginning at check-in and work shifts in the infirmary as well as help with dispensing and administering medications, changing dressings, and applying ointments or other topical medications. When not assisting with medical care, medical staff can get to know the campers; help out with arts and crafts, games, sports, and other camp activities; and put on skits and plays for campers at nightly camp hangouts (Figure 1).

Native American Health Services Rotation

Located in the southwestern United States, the Navajo Nation is North America’s largest Native American tribe by enrollment and resides on the largest reservation in the United States.¹⁰ Comprised of 27,000 square miles within portions of Arizona, New Mexico, and Utah, the reservation’s total area is greater than that of Massachusetts, Vermont, and New Hampshire combined.¹¹ The reservation is home to an estimated 180,000 Navajo people, a population roughly the size of Salt Lake City, Utah. Yet, many homes on the reservation are without electricity, running water, telephones, or broadband access, and many roads on the reservation remain unpaved. Prior to the COVID-19 pandemic, 4 dermatology residents were selected each year to travel to this unique and remote location to work with the staff of the Chinle Comprehensive Health Care Facility (Chinle, Arizona), an Indian Health Service facility, as part of the American Academy of Dermatology (AAD)–sponsored Native American Health Services Resident Rotation (NAHSRR).

Dr. Lucinda Kohn, Assistant Professor of Dermatology at the University of Colorado and the director of the NAHSRR program discovered the value of this rotation firsthand as a dermatology resident. In 2017, she traveled to the area to spend 2 weeks serving within the community. “I went because of a personal connection. My husband is Native American, although not Navajo. I wanted to experience what it was like to provide dermatologic care for Native Americans. I found the Navajo people to be so friendly and so grateful for our care. The clinicians we worked with at Chinle were excited to have us share our expertise and to pass on their knowledge to us,” said Dr. Kohn (personal communication, June 24, 2021).

Rotating residents provide dermatologic care for the Navajo people and share their unique medical skill set to local primary care clinicians serving as preceptors. They also may have an opportunity to learn from Native healers about traditional Navajo beliefs and ceremonies used as part of a holistic approach to healing.

The program, similar to volunteer programs across the country, was put on hold during the height of the COVID-19 pandemic. “The Navajo nation witnessed a really tragic surge of COVID cases that required that limited medical resources be diverted to help cope with the pandemic,” says Dr. Kohn. “It really wasn’t safe for residents to travel to the reservation either, so the rotation had to be put on hold.” However, in April 2021, the health care staff of the Chinle Comprehensive Care Facility reached out to revive the program, which is now pending the green light from the AAD. It is unclear if or when AAD leadership will allow this rotation to restart. Dr. Kohn hopes to be able to start accepting new applications soon. “This rotation provides a wealth of benefits to all those involved, from the residents who get the chance to work with a unique population in need to the clinicians who gain a diverse understanding of dermatology treatment techniques. And of course, for the patients, who are so appreciative of the care they receive from our volunteers” (personal communication, June 25, 2021).

How to Get Involved
Dr. Kohn is happy to field questions regarding the rotation and requests for more information via email ([email protected]). Residents interested in this program also may reach out to the AAD’s Education and Volunteers Abroad Committee to express interest in the NAHSRR program’s reinstatement.

Destination Healthy Skin

Since 2017, the Skin Cancer Foundation’s Destination Healthy Skin (DHS) RV has been the setting for more than 3800 free skin cancer screenings provided by volunteers within underserved populations across the United States (Figure 2). After a year hiatus due to the pandemic, DHS hit the road again, starting in New York City on August 1 to 3, 2021. From there, the DHS RV will traverse the country in one large loop, starting with visits to large and small cities in the Midwest and the West Coast. Following a visit to San Diego, California, in early October, the RV will turn east, with stops in Arizona, Texas, and several southern states before ending in Philadelphia, Pennsylvania. Dr. Elizabeth Hale, Senior Vice President of the Skin Cancer Foundation, feels that increasing awareness of the importance of regular skin cancer screening for those at risk is more important than ever. “We know that many people in the past year put routine cancer screening on the back burner, but we’re beginning to appreciate that this has led to significant delays in skin cancer diagnosis and potentially more significant disease when cases are diagnosed.” Dr. Hale noted that as the country continues to return to a degree of normalcy, the backlog of patients now seeking their routine screening has led to longer wait times. She expects DHS may offer some relief. “There are no appointments necessary. If the RV is close to their hometown, patients have an advantage in being able to be seen first come, first served, without having to wait for an appointment or make sure their insurance is accepted. It’s a free screening that can increase access to dermatologists” (personal communication, June 21, 2021).

The program’s organizers acknowledge that DHS is not a long-term solution for improving dermatology access in the United States and recognize that more needs to be done to raise awareness, both of the value that screenings can provide and the importance of sun-protective behavior. “This is an important first step,” says Dr. Hale. “It’s important that we disseminate that no one is immune to skin cancer. It’s about education, and this is a tool to educate patients that everyone should have a skin check once a year, regardless of where you live or what your skin type is” (personal communication, June 21, 2021).

Volunteer dermatologists are needed to assist with screenings when the DHS RV arrives in their community. Providers complete a screening form identifying any concerning lesions and can document specific lesions using the patient’s cell phone. Following the screenings, participating dermatologists are welcome to invite participants to make appointments at their practices or suggest local clinics for follow-up care.

How to Get Involved
The schedule for this year’s screening events can be found online (https://www.skincancer.org/early-detection/destination-healthy-skin/). Consider volunteering (https://www.skincancer.org/early-detection/destination-healthy-skin/physician-volunteers/) or helping to raise awareness by reaching out to local dermatology societies or free clinics in your area. Residents and physician’s assistants are welcome to volunteer as well, as long as they are under the on-site supervision of a board-certified dermatologist.

Final Thoughts

As medical professionals, we all recognize there are valuable contributions we can make to groups and organizations that need our help. The stresses and pressure of work and everyday life can make finding the time to offer that help seem impossible. Although it may seem counterintuitive, volunteering our time to help others can help us better navigate the professional burnout that many medical professionals experience today.

The adage “so much to do, so little time” aptly describes the daily challenges facing dermatologists and dermatology residents. The time and attention required by direct patient care, writing notes, navigating electronic health records, and engaging in education and research as well as family commitments can drain even the most tireless clinician. In addition, dermatologists are expected to play a critical role in clinic and practice management to successfully curate an online presence and adapt their skills to successfully manage a teledermatology practice. Coupled with the time spent socializing with friends or colleagues and time for personal hobbies or exercise, it’s easy to see how sleep deprivation is common in many of our colleagues.

What’s being left out of these jam-packed schedules? Increasingly, it is the time and expertise dedicated to volunteering in our local communities. Two recent research letters highlighted how a dramatic increase in the number of research projects and publications is not mirrored by a similar increase in volunteer experiences as dermatology residency selection becomes more competitive.^1,2

Although the rate of volunteerism among practicing dermatologists has yet to be studied, a brief review suggests a component of unmet dermatology need within our communities. It’s estimated that approximately 5% to 10% of all emergency department visits are for dermatologic concerns.^3-5 In many cases, the reason for the visit is nonurgent and instead reflects a lack of other options for care. However, the need for dermatologists extends beyond the emergency department setting. A review of the prevalence of patients presenting for care to a group of regional free clinics found that 8% (N=5553) of all visitors sought care for dermatologic concerns.⁶ The benefit is not just for those seated on the examination table; research has shown that while many of the underlying factors resulting in physician burnout stem from systemic issues, participating in volunteer opportunities helps combat burnout in ourselves and our colleagues.^7-9 Herein, opportunities that exist for dermatologists to reconnect with their communities, advocate for causes distinctive to the specialty, and care for neighbors most in need are highlighted.

Camp Wonder

Every year, children from across the United States living with chronic and debilitating skin conditions get the opportunity to join fellow campers and spend a week just being kids without the constant focus on being a patient. Camp Wonder’s founder and director, Francesca Tenconi, describes the camp as a place where kids “can form a community and can feel free to be themselves, without judgment, without stares. They get the chance to forget about their skin disease and be themselves” (oral communication, June 18, 2021). Tenconi and the camp’s cofounders and medical directors, Drs. Jenny Kim and Stefani Takahashi, envisioned the camp as a place for all campers regardless of their skin condition to feel safe and welcome. This overall mission guides camp leadership and staff every year over the course of the camp week where campers participate in a mix of traditional and nontraditional summer activities that are safe and accessible for all, from spending time in the pool to arts and crafts and a ropes course.

Camp Wonder is in its 21st year of hosting children and adolescents from across North America at its camp in Livermore, California. This year, Tenconi expects about 100 campers during the last week in July. Camp Wonder relies on medical staff volunteers to make the camp setting safe, inclusive, and fun. “Our dermatology residents and dermatology volunteers are a huge part of why we’re able to have camp,” said Tenconi. “A lot of our kids require very specific medical care throughout the week. We are able to provide this camp experience for them because we have this medical support system available, this specialized dermatology knowledge.” She also noted the benefit to the volunteers themselves, saying,“The feedback we get a lot from residents and dermatologists is that camp gave them a chance to understand the true-life impact of some of the skin diseases these kids and families are living with. Kids will open up to them and tell them how their disease has impacted them personally” (oral communication, June 18, 2021).

Volunteer medical providers help manage the medical needs of the campers beginning at check-in and work shifts in the infirmary as well as help with dispensing and administering medications, changing dressings, and applying ointments or other topical medications. When not assisting with medical care, medical staff can get to know the campers; help out with arts and crafts, games, sports, and other camp activities; and put on skits and plays for campers at nightly camp hangouts (Figure 1).

Native American Health Services Rotation

Located in the southwestern United States, the Navajo Nation is North America’s largest Native American tribe by enrollment and resides on the largest reservation in the United States.¹⁰ Comprised of 27,000 square miles within portions of Arizona, New Mexico, and Utah, the reservation’s total area is greater than that of Massachusetts, Vermont, and New Hampshire combined.¹¹ The reservation is home to an estimated 180,000 Navajo people, a population roughly the size of Salt Lake City, Utah. Yet, many homes on the reservation are without electricity, running water, telephones, or broadband access, and many roads on the reservation remain unpaved. Prior to the COVID-19 pandemic, 4 dermatology residents were selected each year to travel to this unique and remote location to work with the staff of the Chinle Comprehensive Health Care Facility (Chinle, Arizona), an Indian Health Service facility, as part of the American Academy of Dermatology (AAD)–sponsored Native American Health Services Resident Rotation (NAHSRR).

Dr. Lucinda Kohn, Assistant Professor of Dermatology at the University of Colorado and the director of the NAHSRR program discovered the value of this rotation firsthand as a dermatology resident. In 2017, she traveled to the area to spend 2 weeks serving within the community. “I went because of a personal connection. My husband is Native American, although not Navajo. I wanted to experience what it was like to provide dermatologic care for Native Americans. I found the Navajo people to be so friendly and so grateful for our care. The clinicians we worked with at Chinle were excited to have us share our expertise and to pass on their knowledge to us,” said Dr. Kohn (personal communication, June 24, 2021).

Rotating residents provide dermatologic care for the Navajo people and share their unique medical skill set to local primary care clinicians serving as preceptors. They also may have an opportunity to learn from Native healers about traditional Navajo beliefs and ceremonies used as part of a holistic approach to healing.

The program, similar to volunteer programs across the country, was put on hold during the height of the COVID-19 pandemic. “The Navajo nation witnessed a really tragic surge of COVID cases that required that limited medical resources be diverted to help cope with the pandemic,” says Dr. Kohn. “It really wasn’t safe for residents to travel to the reservation either, so the rotation had to be put on hold.” However, in April 2021, the health care staff of the Chinle Comprehensive Care Facility reached out to revive the program, which is now pending the green light from the AAD. It is unclear if or when AAD leadership will allow this rotation to restart. Dr. Kohn hopes to be able to start accepting new applications soon. “This rotation provides a wealth of benefits to all those involved, from the residents who get the chance to work with a unique population in need to the clinicians who gain a diverse understanding of dermatology treatment techniques. And of course, for the patients, who are so appreciative of the care they receive from our volunteers” (personal communication, June 25, 2021).

How to Get Involved
Dr. Kohn is happy to field questions regarding the rotation and requests for more information via email ([email protected]). Residents interested in this program also may reach out to the AAD’s Education and Volunteers Abroad Committee to express interest in the NAHSRR program’s reinstatement.

Destination Healthy Skin

Since 2017, the Skin Cancer Foundation’s Destination Healthy Skin (DHS) RV has been the setting for more than 3800 free skin cancer screenings provided by volunteers within underserved populations across the United States (Figure 2). After a year hiatus due to the pandemic, DHS hit the road again, starting in New York City on August 1 to 3, 2021. From there, the DHS RV will traverse the country in one large loop, starting with visits to large and small cities in the Midwest and the West Coast. Following a visit to San Diego, California, in early October, the RV will turn east, with stops in Arizona, Texas, and several southern states before ending in Philadelphia, Pennsylvania. Dr. Elizabeth Hale, Senior Vice President of the Skin Cancer Foundation, feels that increasing awareness of the importance of regular skin cancer screening for those at risk is more important than ever. “We know that many people in the past year put routine cancer screening on the back burner, but we’re beginning to appreciate that this has led to significant delays in skin cancer diagnosis and potentially more significant disease when cases are diagnosed.” Dr. Hale noted that as the country continues to return to a degree of normalcy, the backlog of patients now seeking their routine screening has led to longer wait times. She expects DHS may offer some relief. “There are no appointments necessary. If the RV is close to their hometown, patients have an advantage in being able to be seen first come, first served, without having to wait for an appointment or make sure their insurance is accepted. It’s a free screening that can increase access to dermatologists” (personal communication, June 21, 2021).

The program’s organizers acknowledge that DHS is not a long-term solution for improving dermatology access in the United States and recognize that more needs to be done to raise awareness, both of the value that screenings can provide and the importance of sun-protective behavior. “This is an important first step,” says Dr. Hale. “It’s important that we disseminate that no one is immune to skin cancer. It’s about education, and this is a tool to educate patients that everyone should have a skin check once a year, regardless of where you live or what your skin type is” (personal communication, June 21, 2021).

Volunteer dermatologists are needed to assist with screenings when the DHS RV arrives in their community. Providers complete a screening form identifying any concerning lesions and can document specific lesions using the patient’s cell phone. Following the screenings, participating dermatologists are welcome to invite participants to make appointments at their practices or suggest local clinics for follow-up care.

How to Get Involved
The schedule for this year’s screening events can be found online (https://www.skincancer.org/early-detection/destination-healthy-skin/). Consider volunteering (https://www.skincancer.org/early-detection/destination-healthy-skin/physician-volunteers/) or helping to raise awareness by reaching out to local dermatology societies or free clinics in your area. Residents and physician’s assistants are welcome to volunteer as well, as long as they are under the on-site supervision of a board-certified dermatologist.

Final Thoughts

As medical professionals, we all recognize there are valuable contributions we can make to groups and organizations that need our help. The stresses and pressure of work and everyday life can make finding the time to offer that help seem impossible. Although it may seem counterintuitive, volunteering our time to help others can help us better navigate the professional burnout that many medical professionals experience today.

The adage “so much to do, so little time” aptly describes the daily challenges facing dermatologists and dermatology residents. The time and attention required by direct patient care, writing notes, navigating electronic health records, and engaging in education and research as well as family commitments can drain even the most tireless clinician. In addition, dermatologists are expected to play a critical role in clinic and practice management to successfully curate an online presence and adapt their skills to successfully manage a teledermatology practice. Coupled with the time spent socializing with friends or colleagues and time for personal hobbies or exercise, it’s easy to see how sleep deprivation is common in many of our colleagues.

What’s being left out of these jam-packed schedules? Increasingly, it is the time and expertise dedicated to volunteering in our local communities. Two recent research letters highlighted how a dramatic increase in the number of research projects and publications is not mirrored by a similar increase in volunteer experiences as dermatology residency selection becomes more competitive.^1,2

Although the rate of volunteerism among practicing dermatologists has yet to be studied, a brief review suggests a component of unmet dermatology need within our communities. It’s estimated that approximately 5% to 10% of all emergency department visits are for dermatologic concerns.^3-5 In many cases, the reason for the visit is nonurgent and instead reflects a lack of other options for care. However, the need for dermatologists extends beyond the emergency department setting. A review of the prevalence of patients presenting for care to a group of regional free clinics found that 8% (N=5553) of all visitors sought care for dermatologic concerns.⁶ The benefit is not just for those seated on the examination table; research has shown that while many of the underlying factors resulting in physician burnout stem from systemic issues, participating in volunteer opportunities helps combat burnout in ourselves and our colleagues.^7-9 Herein, opportunities that exist for dermatologists to reconnect with their communities, advocate for causes distinctive to the specialty, and care for neighbors most in need are highlighted.

Camp Wonder

Every year, children from across the United States living with chronic and debilitating skin conditions get the opportunity to join fellow campers and spend a week just being kids without the constant focus on being a patient. Camp Wonder’s founder and director, Francesca Tenconi, describes the camp as a place where kids “can form a community and can feel free to be themselves, without judgment, without stares. They get the chance to forget about their skin disease and be themselves” (oral communication, June 18, 2021). Tenconi and the camp’s cofounders and medical directors, Drs. Jenny Kim and Stefani Takahashi, envisioned the camp as a place for all campers regardless of their skin condition to feel safe and welcome. This overall mission guides camp leadership and staff every year over the course of the camp week where campers participate in a mix of traditional and nontraditional summer activities that are safe and accessible for all, from spending time in the pool to arts and crafts and a ropes course.

Camp Wonder is in its 21st year of hosting children and adolescents from across North America at its camp in Livermore, California. This year, Tenconi expects about 100 campers during the last week in July. Camp Wonder relies on medical staff volunteers to make the camp setting safe, inclusive, and fun. “Our dermatology residents and dermatology volunteers are a huge part of why we’re able to have camp,” said Tenconi. “A lot of our kids require very specific medical care throughout the week. We are able to provide this camp experience for them because we have this medical support system available, this specialized dermatology knowledge.” She also noted the benefit to the volunteers themselves, saying,“The feedback we get a lot from residents and dermatologists is that camp gave them a chance to understand the true-life impact of some of the skin diseases these kids and families are living with. Kids will open up to them and tell them how their disease has impacted them personally” (oral communication, June 18, 2021).

Volunteer medical providers help manage the medical needs of the campers beginning at check-in and work shifts in the infirmary as well as help with dispensing and administering medications, changing dressings, and applying ointments or other topical medications. When not assisting with medical care, medical staff can get to know the campers; help out with arts and crafts, games, sports, and other camp activities; and put on skits and plays for campers at nightly camp hangouts (Figure 1).

Native American Health Services Rotation

Located in the southwestern United States, the Navajo Nation is North America’s largest Native American tribe by enrollment and resides on the largest reservation in the United States.¹⁰ Comprised of 27,000 square miles within portions of Arizona, New Mexico, and Utah, the reservation’s total area is greater than that of Massachusetts, Vermont, and New Hampshire combined.¹¹ The reservation is home to an estimated 180,000 Navajo people, a population roughly the size of Salt Lake City, Utah. Yet, many homes on the reservation are without electricity, running water, telephones, or broadband access, and many roads on the reservation remain unpaved. Prior to the COVID-19 pandemic, 4 dermatology residents were selected each year to travel to this unique and remote location to work with the staff of the Chinle Comprehensive Health Care Facility (Chinle, Arizona), an Indian Health Service facility, as part of the American Academy of Dermatology (AAD)–sponsored Native American Health Services Resident Rotation (NAHSRR).

Dr. Lucinda Kohn, Assistant Professor of Dermatology at the University of Colorado and the director of the NAHSRR program discovered the value of this rotation firsthand as a dermatology resident. In 2017, she traveled to the area to spend 2 weeks serving within the community. “I went because of a personal connection. My husband is Native American, although not Navajo. I wanted to experience what it was like to provide dermatologic care for Native Americans. I found the Navajo people to be so friendly and so grateful for our care. The clinicians we worked with at Chinle were excited to have us share our expertise and to pass on their knowledge to us,” said Dr. Kohn (personal communication, June 24, 2021).

Rotating residents provide dermatologic care for the Navajo people and share their unique medical skill set to local primary care clinicians serving as preceptors. They also may have an opportunity to learn from Native healers about traditional Navajo beliefs and ceremonies used as part of a holistic approach to healing.

The program, similar to volunteer programs across the country, was put on hold during the height of the COVID-19 pandemic. “The Navajo nation witnessed a really tragic surge of COVID cases that required that limited medical resources be diverted to help cope with the pandemic,” says Dr. Kohn. “It really wasn’t safe for residents to travel to the reservation either, so the rotation had to be put on hold.” However, in April 2021, the health care staff of the Chinle Comprehensive Care Facility reached out to revive the program, which is now pending the green light from the AAD. It is unclear if or when AAD leadership will allow this rotation to restart. Dr. Kohn hopes to be able to start accepting new applications soon. “This rotation provides a wealth of benefits to all those involved, from the residents who get the chance to work with a unique population in need to the clinicians who gain a diverse understanding of dermatology treatment techniques. And of course, for the patients, who are so appreciative of the care they receive from our volunteers” (personal communication, June 25, 2021).

How to Get Involved
Dr. Kohn is happy to field questions regarding the rotation and requests for more information via email ([email protected]). Residents interested in this program also may reach out to the AAD’s Education and Volunteers Abroad Committee to express interest in the NAHSRR program’s reinstatement.

Destination Healthy Skin

Since 2017, the Skin Cancer Foundation’s Destination Healthy Skin (DHS) RV has been the setting for more than 3800 free skin cancer screenings provided by volunteers within underserved populations across the United States (Figure 2). After a year hiatus due to the pandemic, DHS hit the road again, starting in New York City on August 1 to 3, 2021. From there, the DHS RV will traverse the country in one large loop, starting with visits to large and small cities in the Midwest and the West Coast. Following a visit to San Diego, California, in early October, the RV will turn east, with stops in Arizona, Texas, and several southern states before ending in Philadelphia, Pennsylvania. Dr. Elizabeth Hale, Senior Vice President of the Skin Cancer Foundation, feels that increasing awareness of the importance of regular skin cancer screening for those at risk is more important than ever. “We know that many people in the past year put routine cancer screening on the back burner, but we’re beginning to appreciate that this has led to significant delays in skin cancer diagnosis and potentially more significant disease when cases are diagnosed.” Dr. Hale noted that as the country continues to return to a degree of normalcy, the backlog of patients now seeking their routine screening has led to longer wait times. She expects DHS may offer some relief. “There are no appointments necessary. If the RV is close to their hometown, patients have an advantage in being able to be seen first come, first served, without having to wait for an appointment or make sure their insurance is accepted. It’s a free screening that can increase access to dermatologists” (personal communication, June 21, 2021).

The program’s organizers acknowledge that DHS is not a long-term solution for improving dermatology access in the United States and recognize that more needs to be done to raise awareness, both of the value that screenings can provide and the importance of sun-protective behavior. “This is an important first step,” says Dr. Hale. “It’s important that we disseminate that no one is immune to skin cancer. It’s about education, and this is a tool to educate patients that everyone should have a skin check once a year, regardless of where you live or what your skin type is” (personal communication, June 21, 2021).

Volunteer dermatologists are needed to assist with screenings when the DHS RV arrives in their community. Providers complete a screening form identifying any concerning lesions and can document specific lesions using the patient’s cell phone. Following the screenings, participating dermatologists are welcome to invite participants to make appointments at their practices or suggest local clinics for follow-up care.

How to Get Involved
The schedule for this year’s screening events can be found online (https://www.skincancer.org/early-detection/destination-healthy-skin/). Consider volunteering (https://www.skincancer.org/early-detection/destination-healthy-skin/physician-volunteers/) or helping to raise awareness by reaching out to local dermatology societies or free clinics in your area. Residents and physician’s assistants are welcome to volunteer as well, as long as they are under the on-site supervision of a board-certified dermatologist.

Final Thoughts

As medical professionals, we all recognize there are valuable contributions we can make to groups and organizations that need our help. The stresses and pressure of work and everyday life can make finding the time to offer that help seem impossible. Although it may seem counterintuitive, volunteering our time to help others can help us better navigate the professional burnout that many medical professionals experience today.

The Diagnosis: Pemphigus Foliaceous

Laboratory workup including a complete blood cell count with differential, comprehensive metabolic panel, antinuclear antibodies, Sjögren syndrome A and B antibodies, hepatitis profile, rapid plasma reagin, HIV screen, aldolase, anti–Jo-1, T-Spot TB test (Quest Diagnostics), and tissue cultures was unremarkable. Two 4-mm punch biopsies were obtained from the left cheek and upper back, both of which demonstrated intragranular acantholysis suggestive of pemphigus foliaceous (Figure 1A). A subsequent punch biopsy from the right lower abdomen sent for direct immunofluorescence demonstrated netlike positivity of IgG and C3 in the upper epidermis (Figure 1B), and serum sent for indirect immunofluorescence demonstrated intercellular IgG antibodies to desmoglein (Dsg) 1 on monkey esophagus and positive Dsg-1 antibodies on enzyme-linked immunosorbent assay, confirming the diagnosis.

The patient was started on a 60-mg prednisone taper as well as dapsone 50 mg daily; the dapsone was titrated up to 100 mg daily. After tapering down to 10 mg daily of prednisone over 2 months and continuing dapsone with minimal improvement, he was given 2 infusions of rituximab 1000 mg 2 weeks apart. The scalp plaque was dramatically improved at 3-month follow-up (Figure 2), with partial improvement of the cheek plaques (Figure 3). Dapsone was increased to 150 mg daily, and he was encouraged to use triamcinolone acetonide ointment 0.1% twice daily, which led to further improvement.

Pemphigus foliaceus is an autoimmune blistering disease that most commonly occurs in middle-aged adults. It generally is less common than pemphigus vulgaris, except in Finland, Tunisia, and Brazil, where there is an endemic condition with an identical clinical and histological presentation known as fogo selvagem.¹

The pathogenesis of pemphigus foliaceous is characterized by IgG autoantibodies against Dsg-1, a transmembrane glycoprotein involved in the cellular adhesion of keratinocytes, which is preferentially expressed in the superficial epidermis.^2-7 Dysfunction of Dsg-1 results in the separation of superficial epidermal cells, resulting in intraepidermal blisters.^2,7 In contrast to pemphigus vulgaris, there typically is a lack of oral mucosal involvement due to compensation by Dsg-3 in the mucosa.⁴ Potential triggers for pemphigus foliaceous include exposure to UV radiation; radiotherapy; pregnancy; physiologic stress; and drugs, most commonly captopril, penicillamine, and thiols.⁸

Pemphigus foliaceous lesions clinically appear as eroded and crusted lesions on an erythematous base, commonly in a seborrheic distribution on the face, scalp, and trunk with sparing of the oral mucosa,^2,6 but lesions can progress to a widespread and more severe exfoliative dermatitis.⁷ Lesions also can appear as psoriasiform plaques and often are initially misdiagnosed as psoriasis, particularly in patients with skin of color.^9,10

Diagnosis of pemphigus foliaceous typically is made using a combination of histology as well as both direct and indirect immunofluorescence. Histologically, pemphigus foliaceus presents with subcorneal acantholysis, which is most prominent in the granular layer and occasionally the presence of neutrophils and eosinophils in the blister cavity.⁷ Direct immunofluorescence demonstrates netlike intercellular IgG and C3 in the upper portion of the epidermis.¹¹ Indirect immunofluorescence can help detect circulating IgG antibodies to Dsg-1, with guinea pig esophagus being the ideal substrate.^11,12

First-line treatment of pemphigus foliaceus consists of systemic glucocorticoid therapy, often administered with azathioprine, methotrexate, or mycophenolate mofetil.^2,6,13 Although first-line treatment is effective in 60% to 80% of patients,² relapsing cases can be treated with cyclophosphamide, intravenous immunoglobulin, immunoadsorption, plasmapheresis, or rituximab.²

Rituximab is a chimeric monoclonal antibody targeting CD20⁺ B cells, leading to decreased antibody production, which has been shown to be effective in treating severe and refractory cases of pemphigus foliaceus.^6,13Rituximab with short-course prednisone has been found to be more effective in achieving complete remission at 24 months than prednisone alone.¹⁴ In patients with contraindications to systemic glucocorticoid therapy, rituximab has been shown as an effective first-line therapy.¹⁵ One-quarter of patients treated with rituximab relapsed within 2 years of treatment⁶ (average time to relapse, 6–26 months).¹⁶ High-dose rituximab regimens, along with a higher number of rituximab treatment cycles, have been shown to prolong time to relapse.⁶ Further, higher baseline levels of Dsg-1 antibody have been correlated to earlier relapse and can be used following rituximab therapy to monitor disease progression.^6,16

The differential diagnosis for pemphigus foliaceous includes disseminated blastomycosis, hypertrophic lupus erythematosus, sebopsoriasis, and secondary syphilis. Disseminated blastomycosis presents with cutaneous manifestations such as nodules, papules, or pustules evolving over weeks to months into ulcers with subsequent scarring.¹⁷ Hypertrophic lupus erythematosus presents with papules and nodules with associated keratotic scaling on the face, palms, and extensor surfaces of the limbs.¹⁸ Sebopsoriasis is characterized by well-defined lesions with an overlying scale distributed on the scalp, face, and chest.¹⁹ Secondary syphilis presents as early hyperpigmented macules transitioning to acral papulosquamous lesions involving the palms and soles.²⁰

The Diagnosis: Pemphigus Foliaceous

Laboratory workup including a complete blood cell count with differential, comprehensive metabolic panel, antinuclear antibodies, Sjögren syndrome A and B antibodies, hepatitis profile, rapid plasma reagin, HIV screen, aldolase, anti–Jo-1, T-Spot TB test (Quest Diagnostics), and tissue cultures was unremarkable. Two 4-mm punch biopsies were obtained from the left cheek and upper back, both of which demonstrated intragranular acantholysis suggestive of pemphigus foliaceous (Figure 1A). A subsequent punch biopsy from the right lower abdomen sent for direct immunofluorescence demonstrated netlike positivity of IgG and C3 in the upper epidermis (Figure 1B), and serum sent for indirect immunofluorescence demonstrated intercellular IgG antibodies to desmoglein (Dsg) 1 on monkey esophagus and positive Dsg-1 antibodies on enzyme-linked immunosorbent assay, confirming the diagnosis.

The patient was started on a 60-mg prednisone taper as well as dapsone 50 mg daily; the dapsone was titrated up to 100 mg daily. After tapering down to 10 mg daily of prednisone over 2 months and continuing dapsone with minimal improvement, he was given 2 infusions of rituximab 1000 mg 2 weeks apart. The scalp plaque was dramatically improved at 3-month follow-up (Figure 2), with partial improvement of the cheek plaques (Figure 3). Dapsone was increased to 150 mg daily, and he was encouraged to use triamcinolone acetonide ointment 0.1% twice daily, which led to further improvement.

Pemphigus foliaceus is an autoimmune blistering disease that most commonly occurs in middle-aged adults. It generally is less common than pemphigus vulgaris, except in Finland, Tunisia, and Brazil, where there is an endemic condition with an identical clinical and histological presentation known as fogo selvagem.¹

The pathogenesis of pemphigus foliaceous is characterized by IgG autoantibodies against Dsg-1, a transmembrane glycoprotein involved in the cellular adhesion of keratinocytes, which is preferentially expressed in the superficial epidermis.^2-7 Dysfunction of Dsg-1 results in the separation of superficial epidermal cells, resulting in intraepidermal blisters.^2,7 In contrast to pemphigus vulgaris, there typically is a lack of oral mucosal involvement due to compensation by Dsg-3 in the mucosa.⁴ Potential triggers for pemphigus foliaceous include exposure to UV radiation; radiotherapy; pregnancy; physiologic stress; and drugs, most commonly captopril, penicillamine, and thiols.⁸

Pemphigus foliaceous lesions clinically appear as eroded and crusted lesions on an erythematous base, commonly in a seborrheic distribution on the face, scalp, and trunk with sparing of the oral mucosa,^2,6 but lesions can progress to a widespread and more severe exfoliative dermatitis.⁷ Lesions also can appear as psoriasiform plaques and often are initially misdiagnosed as psoriasis, particularly in patients with skin of color.^9,10

Diagnosis of pemphigus foliaceous typically is made using a combination of histology as well as both direct and indirect immunofluorescence. Histologically, pemphigus foliaceus presents with subcorneal acantholysis, which is most prominent in the granular layer and occasionally the presence of neutrophils and eosinophils in the blister cavity.⁷ Direct immunofluorescence demonstrates netlike intercellular IgG and C3 in the upper portion of the epidermis.¹¹ Indirect immunofluorescence can help detect circulating IgG antibodies to Dsg-1, with guinea pig esophagus being the ideal substrate.^11,12

First-line treatment of pemphigus foliaceus consists of systemic glucocorticoid therapy, often administered with azathioprine, methotrexate, or mycophenolate mofetil.^2,6,13 Although first-line treatment is effective in 60% to 80% of patients,² relapsing cases can be treated with cyclophosphamide, intravenous immunoglobulin, immunoadsorption, plasmapheresis, or rituximab.²

Rituximab is a chimeric monoclonal antibody targeting CD20⁺ B cells, leading to decreased antibody production, which has been shown to be effective in treating severe and refractory cases of pemphigus foliaceus.^6,13Rituximab with short-course prednisone has been found to be more effective in achieving complete remission at 24 months than prednisone alone.¹⁴ In patients with contraindications to systemic glucocorticoid therapy, rituximab has been shown as an effective first-line therapy.¹⁵ One-quarter of patients treated with rituximab relapsed within 2 years of treatment⁶ (average time to relapse, 6–26 months).¹⁶ High-dose rituximab regimens, along with a higher number of rituximab treatment cycles, have been shown to prolong time to relapse.⁶ Further, higher baseline levels of Dsg-1 antibody have been correlated to earlier relapse and can be used following rituximab therapy to monitor disease progression.^6,16

The differential diagnosis for pemphigus foliaceous includes disseminated blastomycosis, hypertrophic lupus erythematosus, sebopsoriasis, and secondary syphilis. Disseminated blastomycosis presents with cutaneous manifestations such as nodules, papules, or pustules evolving over weeks to months into ulcers with subsequent scarring.¹⁷ Hypertrophic lupus erythematosus presents with papules and nodules with associated keratotic scaling on the face, palms, and extensor surfaces of the limbs.¹⁸ Sebopsoriasis is characterized by well-defined lesions with an overlying scale distributed on the scalp, face, and chest.¹⁹ Secondary syphilis presents as early hyperpigmented macules transitioning to acral papulosquamous lesions involving the palms and soles.²⁰

The Diagnosis: Pemphigus Foliaceous

Laboratory workup including a complete blood cell count with differential, comprehensive metabolic panel, antinuclear antibodies, Sjögren syndrome A and B antibodies, hepatitis profile, rapid plasma reagin, HIV screen, aldolase, anti–Jo-1, T-Spot TB test (Quest Diagnostics), and tissue cultures was unremarkable. Two 4-mm punch biopsies were obtained from the left cheek and upper back, both of which demonstrated intragranular acantholysis suggestive of pemphigus foliaceous (Figure 1A). A subsequent punch biopsy from the right lower abdomen sent for direct immunofluorescence demonstrated netlike positivity of IgG and C3 in the upper epidermis (Figure 1B), and serum sent for indirect immunofluorescence demonstrated intercellular IgG antibodies to desmoglein (Dsg) 1 on monkey esophagus and positive Dsg-1 antibodies on enzyme-linked immunosorbent assay, confirming the diagnosis.

The patient was started on a 60-mg prednisone taper as well as dapsone 50 mg daily; the dapsone was titrated up to 100 mg daily. After tapering down to 10 mg daily of prednisone over 2 months and continuing dapsone with minimal improvement, he was given 2 infusions of rituximab 1000 mg 2 weeks apart. The scalp plaque was dramatically improved at 3-month follow-up (Figure 2), with partial improvement of the cheek plaques (Figure 3). Dapsone was increased to 150 mg daily, and he was encouraged to use triamcinolone acetonide ointment 0.1% twice daily, which led to further improvement.

Pemphigus foliaceus is an autoimmune blistering disease that most commonly occurs in middle-aged adults. It generally is less common than pemphigus vulgaris, except in Finland, Tunisia, and Brazil, where there is an endemic condition with an identical clinical and histological presentation known as fogo selvagem.¹

The pathogenesis of pemphigus foliaceous is characterized by IgG autoantibodies against Dsg-1, a transmembrane glycoprotein involved in the cellular adhesion of keratinocytes, which is preferentially expressed in the superficial epidermis.^2-7 Dysfunction of Dsg-1 results in the separation of superficial epidermal cells, resulting in intraepidermal blisters.^2,7 In contrast to pemphigus vulgaris, there typically is a lack of oral mucosal involvement due to compensation by Dsg-3 in the mucosa.⁴ Potential triggers for pemphigus foliaceous include exposure to UV radiation; radiotherapy; pregnancy; physiologic stress; and drugs, most commonly captopril, penicillamine, and thiols.⁸

Pemphigus foliaceous lesions clinically appear as eroded and crusted lesions on an erythematous base, commonly in a seborrheic distribution on the face, scalp, and trunk with sparing of the oral mucosa,^2,6 but lesions can progress to a widespread and more severe exfoliative dermatitis.⁷ Lesions also can appear as psoriasiform plaques and often are initially misdiagnosed as psoriasis, particularly in patients with skin of color.^9,10

Diagnosis of pemphigus foliaceous typically is made using a combination of histology as well as both direct and indirect immunofluorescence. Histologically, pemphigus foliaceus presents with subcorneal acantholysis, which is most prominent in the granular layer and occasionally the presence of neutrophils and eosinophils in the blister cavity.⁷ Direct immunofluorescence demonstrates netlike intercellular IgG and C3 in the upper portion of the epidermis.¹¹ Indirect immunofluorescence can help detect circulating IgG antibodies to Dsg-1, with guinea pig esophagus being the ideal substrate.^11,12

First-line treatment of pemphigus foliaceus consists of systemic glucocorticoid therapy, often administered with azathioprine, methotrexate, or mycophenolate mofetil.^2,6,13 Although first-line treatment is effective in 60% to 80% of patients,² relapsing cases can be treated with cyclophosphamide, intravenous immunoglobulin, immunoadsorption, plasmapheresis, or rituximab.²

Rituximab is a chimeric monoclonal antibody targeting CD20⁺ B cells, leading to decreased antibody production, which has been shown to be effective in treating severe and refractory cases of pemphigus foliaceus.^6,13Rituximab with short-course prednisone has been found to be more effective in achieving complete remission at 24 months than prednisone alone.¹⁴ In patients with contraindications to systemic glucocorticoid therapy, rituximab has been shown as an effective first-line therapy.¹⁵ One-quarter of patients treated with rituximab relapsed within 2 years of treatment⁶ (average time to relapse, 6–26 months).¹⁶ High-dose rituximab regimens, along with a higher number of rituximab treatment cycles, have been shown to prolong time to relapse.⁶ Further, higher baseline levels of Dsg-1 antibody have been correlated to earlier relapse and can be used following rituximab therapy to monitor disease progression.^6,16

The differential diagnosis for pemphigus foliaceous includes disseminated blastomycosis, hypertrophic lupus erythematosus, sebopsoriasis, and secondary syphilis. Disseminated blastomycosis presents with cutaneous manifestations such as nodules, papules, or pustules evolving over weeks to months into ulcers with subsequent scarring.¹⁷ Hypertrophic lupus erythematosus presents with papules and nodules with associated keratotic scaling on the face, palms, and extensor surfaces of the limbs.¹⁸ Sebopsoriasis is characterized by well-defined lesions with an overlying scale distributed on the scalp, face, and chest.¹⁹ Secondary syphilis presents as early hyperpigmented macules transitioning to acral papulosquamous lesions involving the palms and soles.²⁰

To the Editor:

Protothecosis infections are caused by an achlorophyllic algae of the species Prototheca. Prototheca organisms are found mostly in soil and water.¹ Human infections are rare and involve 2 species, Prototheca wickerhamii and Prototheca zopfii. The former most commonly is responsible for human infections, though P zopfii results in more serious systemic infections with a poor prognosis. There are various types of Prototheca infection presentations, with a 2007 review of 117 cases reporting that cutaneous infections are most common (66%), followed by systemic infections (19%), and olecranon bursitis (15%).² Skin lesions most commonly occur on the extremities and face, and they present as vesiculobullous and ulcerative lesions with purulent drainage. The skin lesions also may appear as erythematous plaques or nodules, subcutaneous papules, verrucous or herpetiformis lesions, or pyogenic granuloma–like lesions.³ Protothecosis typically affects immunocompromised individuals, especially those with a history of chronic corticosteroid use, malignancy, diabetes mellitus, AIDS, and/or organ transplant.¹ We present a case of cutaneous protothecosis on the dorsal distal extremity of a 94-year-old woman. History of exposure to soil while gardening was elicited from the patient, and no immunosuppressive history was present aside from the patient’s age. This case may prompt workup for malignancy or immunosuppression in this patient subset.

A 94-year-old woman with a medical history of cutaneous squamous cell carcinoma (SCC) presented with a growing lesion on the dorsal surface of the left fourth digit of 2 months’ duration. The patient reported the lesion was painful, and she noted preceding trauma to the area that was suspected to have occurred while gardening. Physical examination revealed an ulcerated, hypertrophic, erythematous nodule on the dorsal surface of the left fourth metacarpophalangeal joint. The differential diagnosis included SCC, inflamed cyst, verruca vulgaris, and orf virus due to the clinical presentation. A shave biopsy was performed, and the lesion subsequently was treated with electrodesiccation and curettage.

Histopathologic evaluation revealed pseudoepitheliomatous hyperplasia with a mixed inflammatory infiltrate including lymphocytes and histiocytes. A morula within the dermis was characteristic of a protothecosis infection (Figure 1). On follow-up visit 6 weeks later, the lesion had grown back to its original size and morphology (Figure 2). At this time, the lesion was again treated with shave removal, followed by electrodesiccation and curettage, and the patient was placed on oral fluconazole 200 mg daily for 1 month. When the lesion did not resolve with fluconazole, she was referred to infectious disease as well as general surgery for surgical removal and debridement of the lesion. Unfortunately, the patient was lost to follow-up.

Protothecosis is an infectious disease comprised of achlorophyllic algae found in soil and water that rarely affects humans. When it does affect humans, cutaneous infections are most common. All human cases in which organisms were identified to species level have been caused by P wickerhamii or P zopfii species.² Inoculation is suspected to occur through trauma to affected skin, especially when in the context of contaminated water. Our patient reported history of trauma to the hand, with soil from gardening as the potential aquagenic source of the infection.

The clinical presentation of protothecosis ranges from localized cutaneous to disseminated systemic infections, with most reported cases of systemic disease occurring in immunocompromised individuals. The cutaneous lesions of protothecosis vary greatly in clinical appearance including ulcerative nodules (as in our case), papules, plaques, pustules, and vesicles with erosion or crusting.⁴

Cutaneous protothecosis has the potential to mimic many other skin diseases and lesions, and, given its rarity, it may not be on the radar of dermatologists. Our patient’s lesion was presumed to be a skin cancer and was treated as such because of the history of SCC and clinical presentation. Although excision of individual lesions of protothecosis can be curative, electrodesiccation and curettage does not appear to be an adequate treatment, as the lesion subsequently recurred. It also is possible that this case represents P zopfii infection, as it did not respond to treatment with oral fluconazole, though in vitro studies with fluconazole to both P zopfii and P wickerhamii had variable treatment success.² Also, the histopathologic findings were most consistent with P wickerhamii, revealing small, round, symmetrical morula, compared to P zopfii, which typically will display oval or cylindrical, asymmetrical, random internal segmentation.⁵ This case may warrant determination of species, which can be accomplished by a culture on Sabouraud dextrose agar, carbohydrate and alcohol assimilation test, yeast biochemical card, serological typing by immunoblotting, immunofluorescence study using species-specific antibodies, or amplification by polymerase chain reaction for small subunit ribosomal DNA sequences.^2,6-8

The natural history of isolated skin disease is an indolent progressive course; however, reports do exist noting spontaneous resolution.^4,9 Treatment options for Prototheca infections can be disappointing and consist of both surgical and medical management, or a combination of the 2 approaches. Reports in the literature support the use of antifungals including ketoconazole, voriconazole, itraconazole, fluconazole, and amphotericin B, with the latter displaying the best activity against Prototheca species.² Tetracycline has been used in combination with oral or topical amphotericin B and was found to be synergistic in vitro and in case reports at successfully treating cutaneous protothecosis infections. It is possible that our patient was not treated with fluconazole long enough for it to become therapeutic, as most reported treatment regimens are weeks to months in length. Conversely, it may have been of benefit to transition the patient to topical amphotericin B and tetracycline, as fluconazole failed in this patient. However, treatment successes and failures are limited to case reports/case series and in vitro studies, with prospective studies lacking. Due to the variability with in vitro susceptibility profiles for Prototheca species, it generally is not recommended to pursue in vitro susceptibility testing in the management of Prototheca skin infections due to the inconsistency demonstrated between in vitro activity and clinical response to therapy.²

To the Editor:

Protothecosis infections are caused by an achlorophyllic algae of the species Prototheca. Prototheca organisms are found mostly in soil and water.¹ Human infections are rare and involve 2 species, Prototheca wickerhamii and Prototheca zopfii. The former most commonly is responsible for human infections, though P zopfii results in more serious systemic infections with a poor prognosis. There are various types of Prototheca infection presentations, with a 2007 review of 117 cases reporting that cutaneous infections are most common (66%), followed by systemic infections (19%), and olecranon bursitis (15%).² Skin lesions most commonly occur on the extremities and face, and they present as vesiculobullous and ulcerative lesions with purulent drainage. The skin lesions also may appear as erythematous plaques or nodules, subcutaneous papules, verrucous or herpetiformis lesions, or pyogenic granuloma–like lesions.³ Protothecosis typically affects immunocompromised individuals, especially those with a history of chronic corticosteroid use, malignancy, diabetes mellitus, AIDS, and/or organ transplant.¹ We present a case of cutaneous protothecosis on the dorsal distal extremity of a 94-year-old woman. History of exposure to soil while gardening was elicited from the patient, and no immunosuppressive history was present aside from the patient’s age. This case may prompt workup for malignancy or immunosuppression in this patient subset.

A 94-year-old woman with a medical history of cutaneous squamous cell carcinoma (SCC) presented with a growing lesion on the dorsal surface of the left fourth digit of 2 months’ duration. The patient reported the lesion was painful, and she noted preceding trauma to the area that was suspected to have occurred while gardening. Physical examination revealed an ulcerated, hypertrophic, erythematous nodule on the dorsal surface of the left fourth metacarpophalangeal joint. The differential diagnosis included SCC, inflamed cyst, verruca vulgaris, and orf virus due to the clinical presentation. A shave biopsy was performed, and the lesion subsequently was treated with electrodesiccation and curettage.

Histopathologic evaluation revealed pseudoepitheliomatous hyperplasia with a mixed inflammatory infiltrate including lymphocytes and histiocytes. A morula within the dermis was characteristic of a protothecosis infection (Figure 1). On follow-up visit 6 weeks later, the lesion had grown back to its original size and morphology (Figure 2). At this time, the lesion was again treated with shave removal, followed by electrodesiccation and curettage, and the patient was placed on oral fluconazole 200 mg daily for 1 month. When the lesion did not resolve with fluconazole, she was referred to infectious disease as well as general surgery for surgical removal and debridement of the lesion. Unfortunately, the patient was lost to follow-up.

Protothecosis is an infectious disease comprised of achlorophyllic algae found in soil and water that rarely affects humans. When it does affect humans, cutaneous infections are most common. All human cases in which organisms were identified to species level have been caused by P wickerhamii or P zopfii species.² Inoculation is suspected to occur through trauma to affected skin, especially when in the context of contaminated water. Our patient reported history of trauma to the hand, with soil from gardening as the potential aquagenic source of the infection.

The clinical presentation of protothecosis ranges from localized cutaneous to disseminated systemic infections, with most reported cases of systemic disease occurring in immunocompromised individuals. The cutaneous lesions of protothecosis vary greatly in clinical appearance including ulcerative nodules (as in our case), papules, plaques, pustules, and vesicles with erosion or crusting.⁴

Cutaneous protothecosis has the potential to mimic many other skin diseases and lesions, and, given its rarity, it may not be on the radar of dermatologists. Our patient’s lesion was presumed to be a skin cancer and was treated as such because of the history of SCC and clinical presentation. Although excision of individual lesions of protothecosis can be curative, electrodesiccation and curettage does not appear to be an adequate treatment, as the lesion subsequently recurred. It also is possible that this case represents P zopfii infection, as it did not respond to treatment with oral fluconazole, though in vitro studies with fluconazole to both P zopfii and P wickerhamii had variable treatment success.² Also, the histopathologic findings were most consistent with P wickerhamii, revealing small, round, symmetrical morula, compared to P zopfii, which typically will display oval or cylindrical, asymmetrical, random internal segmentation.⁵ This case may warrant determination of species, which can be accomplished by a culture on Sabouraud dextrose agar, carbohydrate and alcohol assimilation test, yeast biochemical card, serological typing by immunoblotting, immunofluorescence study using species-specific antibodies, or amplification by polymerase chain reaction for small subunit ribosomal DNA sequences.^2,6-8

The natural history of isolated skin disease is an indolent progressive course; however, reports do exist noting spontaneous resolution.^4,9 Treatment options for Prototheca infections can be disappointing and consist of both surgical and medical management, or a combination of the 2 approaches. Reports in the literature support the use of antifungals including ketoconazole, voriconazole, itraconazole, fluconazole, and amphotericin B, with the latter displaying the best activity against Prototheca species.² Tetracycline has been used in combination with oral or topical amphotericin B and was found to be synergistic in vitro and in case reports at successfully treating cutaneous protothecosis infections. It is possible that our patient was not treated with fluconazole long enough for it to become therapeutic, as most reported treatment regimens are weeks to months in length. Conversely, it may have been of benefit to transition the patient to topical amphotericin B and tetracycline, as fluconazole failed in this patient. However, treatment successes and failures are limited to case reports/case series and in vitro studies, with prospective studies lacking. Due to the variability with in vitro susceptibility profiles for Prototheca species, it generally is not recommended to pursue in vitro susceptibility testing in the management of Prototheca skin infections due to the inconsistency demonstrated between in vitro activity and clinical response to therapy.²

To the Editor:

Protothecosis infections are caused by an achlorophyllic algae of the species Prototheca. Prototheca organisms are found mostly in soil and water.¹ Human infections are rare and involve 2 species, Prototheca wickerhamii and Prototheca zopfii. The former most commonly is responsible for human infections, though P zopfii results in more serious systemic infections with a poor prognosis. There are various types of Prototheca infection presentations, with a 2007 review of 117 cases reporting that cutaneous infections are most common (66%), followed by systemic infections (19%), and olecranon bursitis (15%).² Skin lesions most commonly occur on the extremities and face, and they present as vesiculobullous and ulcerative lesions with purulent drainage. The skin lesions also may appear as erythematous plaques or nodules, subcutaneous papules, verrucous or herpetiformis lesions, or pyogenic granuloma–like lesions.³ Protothecosis typically affects immunocompromised individuals, especially those with a history of chronic corticosteroid use, malignancy, diabetes mellitus, AIDS, and/or organ transplant.¹ We present a case of cutaneous protothecosis on the dorsal distal extremity of a 94-year-old woman. History of exposure to soil while gardening was elicited from the patient, and no immunosuppressive history was present aside from the patient’s age. This case may prompt workup for malignancy or immunosuppression in this patient subset.

A 94-year-old woman with a medical history of cutaneous squamous cell carcinoma (SCC) presented with a growing lesion on the dorsal surface of the left fourth digit of 2 months’ duration. The patient reported the lesion was painful, and she noted preceding trauma to the area that was suspected to have occurred while gardening. Physical examination revealed an ulcerated, hypertrophic, erythematous nodule on the dorsal surface of the left fourth metacarpophalangeal joint. The differential diagnosis included SCC, inflamed cyst, verruca vulgaris, and orf virus due to the clinical presentation. A shave biopsy was performed, and the lesion subsequently was treated with electrodesiccation and curettage.

Histopathologic evaluation revealed pseudoepitheliomatous hyperplasia with a mixed inflammatory infiltrate including lymphocytes and histiocytes. A morula within the dermis was characteristic of a protothecosis infection (Figure 1). On follow-up visit 6 weeks later, the lesion had grown back to its original size and morphology (Figure 2). At this time, the lesion was again treated with shave removal, followed by electrodesiccation and curettage, and the patient was placed on oral fluconazole 200 mg daily for 1 month. When the lesion did not resolve with fluconazole, she was referred to infectious disease as well as general surgery for surgical removal and debridement of the lesion. Unfortunately, the patient was lost to follow-up.

Protothecosis is an infectious disease comprised of achlorophyllic algae found in soil and water that rarely affects humans. When it does affect humans, cutaneous infections are most common. All human cases in which organisms were identified to species level have been caused by P wickerhamii or P zopfii species.² Inoculation is suspected to occur through trauma to affected skin, especially when in the context of contaminated water. Our patient reported history of trauma to the hand, with soil from gardening as the potential aquagenic source of the infection.

The clinical presentation of protothecosis ranges from localized cutaneous to disseminated systemic infections, with most reported cases of systemic disease occurring in immunocompromised individuals. The cutaneous lesions of protothecosis vary greatly in clinical appearance including ulcerative nodules (as in our case), papules, plaques, pustules, and vesicles with erosion or crusting.⁴

Cutaneous protothecosis has the potential to mimic many other skin diseases and lesions, and, given its rarity, it may not be on the radar of dermatologists. Our patient’s lesion was presumed to be a skin cancer and was treated as such because of the history of SCC and clinical presentation. Although excision of individual lesions of protothecosis can be curative, electrodesiccation and curettage does not appear to be an adequate treatment, as the lesion subsequently recurred. It also is possible that this case represents P zopfii infection, as it did not respond to treatment with oral fluconazole, though in vitro studies with fluconazole to both P zopfii and P wickerhamii had variable treatment success.² Also, the histopathologic findings were most consistent with P wickerhamii, revealing small, round, symmetrical morula, compared to P zopfii, which typically will display oval or cylindrical, asymmetrical, random internal segmentation.⁵ This case may warrant determination of species, which can be accomplished by a culture on Sabouraud dextrose agar, carbohydrate and alcohol assimilation test, yeast biochemical card, serological typing by immunoblotting, immunofluorescence study using species-specific antibodies, or amplification by polymerase chain reaction for small subunit ribosomal DNA sequences.^2,6-8

The natural history of isolated skin disease is an indolent progressive course; however, reports do exist noting spontaneous resolution.^4,9 Treatment options for Prototheca infections can be disappointing and consist of both surgical and medical management, or a combination of the 2 approaches. Reports in the literature support the use of antifungals including ketoconazole, voriconazole, itraconazole, fluconazole, and amphotericin B, with the latter displaying the best activity against Prototheca species.² Tetracycline has been used in combination with oral or topical amphotericin B and was found to be synergistic in vitro and in case reports at successfully treating cutaneous protothecosis infections. It is possible that our patient was not treated with fluconazole long enough for it to become therapeutic, as most reported treatment regimens are weeks to months in length. Conversely, it may have been of benefit to transition the patient to topical amphotericin B and tetracycline, as fluconazole failed in this patient. However, treatment successes and failures are limited to case reports/case series and in vitro studies, with prospective studies lacking. Due to the variability with in vitro susceptibility profiles for Prototheca species, it generally is not recommended to pursue in vitro susceptibility testing in the management of Prototheca skin infections due to the inconsistency demonstrated between in vitro activity and clinical response to therapy.²

The Diagnosis: Generalized Bullous Fixed Drug Eruption

A punch biopsy from the left thigh revealed a vacuolar interface dermatitis with full-thickness necrosis of the epidermis and a patchy lichenoid inflammatory cell infiltrate in the superficial dermis consistent with a generalized bullous fixed drug eruption (GBFDE). The patient received supportive care and methylprednisolone with improvement of symptoms.

Generalized bullous fixed drug eruption is a rare, potentially life-threatening form of a fixed drug eruption (FDE), a cutaneous drug reaction that occurs in response to a causative medication. It typically presents with welldemarcated, dusky, erythematous patches or plaques that recur in the same sites with repeat exposure.¹ The pathogenesis of FDE has been hypothesized to involve epidermal CD8+ T cells, which are activated by drug exposure and release cytotoxic molecules including Fas, Fas ligand, perforin, and granzyme B, resulting in lysis of the surrounding keratinocytes.^1-3 Common eliciting drugs include nonsteroidal anti-inflammatory drugs, antibacterial agents (particularly trimethoprim-sulfamethoxazole), barbiturates, acetaminophen, and antimalarials.1 In addition to the findings seen in FDE, GBFDE is characterized by widespread bullous skin lesions.^1-4 Typical histologic patterns seen in GBFDE are dispersed epidermal apoptotic keratinocytes, prominent dermal eosinophilic and lymphocytic infiltrates, and dermal melanophages.³ Discontinuing the causative agent and diligent prevention of re-exposure are the most important steps in management, as additional exposures can increase the number of lesions and overall severity. Symptoms typically resolve 7 to 14 days after drug discontinuation, often with postinflammatory hyperpigmentation.³

Generalized bullous fixed drug eruption presents a diagnostic challenge, as it sometimes involves the oral mucosa and can exhibit the Nikolsky sign. Thus, it often is confused with Stevens-Johnson syndrome (SJS) or toxic epidermal necrolysis (TEN).^1,4 Stevens-Johnson syndrome and TEN are severe cutaneous drug eruptions that also can present with diffuse bullous skin lesions. Stevens-Johnson syndrome and TEN are thought to be a spectrum of the same disease that initially presents with dusky red macules that can coalesce, develop central blistering, and lead to skin detachment.⁵ Stevens-Johnson syndrome is defined as skin detachment of less than 10% body surface area (BSA); TEN is defined as skin detachment of more than 30% BSA. Stevens-Johnson syndrome/TEN overlap syndrome includes skin detachment of 10% to 30% BSA.⁵

Causative medications overlap substantially with GBFDE and include anticonvulsants, sulfa-containing drugs, antibiotics, nonsteroidal anti-inflammatory drugs, and uric acid–lowering agents. The histology of SJS/TEN also is quite similar to GBFDE, and these entities may be indistinguishable without clinical information.⁵ Lee et al¹ found that absence of grouped necrotic keratinocytes (fire flag sign), deep inflammatory infiltrates, notable pigment incontinence, and higher eosinophil counts appear to be more common in GBFDE than SJS/TEN. Constitutional symptoms and mucosal involvement also were more frequent in SJS/TEN.

The timing of clinical presentation and medical history can be useful in differentiating between SJS/TEN and GBFDE. In SJS/TEN, drug exposure typically occurs 1 to 3 weeks before onset of symptoms vs 30 minutes to 24 hours in GBFDE.³ Additionally, a history of similar eruption in the same location is pathognomonic for GBFDE. Although GBFDE has been thought to have a better prognosis than SJS/TEN, more recent data suggest mortality rates may be similar.³ A case-control study found a mortality rate of 22% (13/58) in patients with GBFDE compared to 28% (n=170) in SJS/TEN patients.⁴

Erythema multiforme (EM) is an uncommon immunemediated disorder that typically presents as targetoid lesions with central epidermal necrosis in an acral distribution. Erythema multiforme can arise from a variety of factors, but up to 90% of cases are due to infection, most commonly herpes simplex virus; medications account for less than 10% of cases.⁶ Previously, EM has been thought to be on the same disease spectrum as SJS and TEN. It is now clear that EM is a separate entity with similar mucosal erosions but different cutaneous findings,⁶ mainly typical target lesions that differ from the atypical targets seen in SJS.

Staphylococcal scalded skin syndrome is a blistering skin disorder associated with local Staphylococcus aureus infection. It most commonly is seen in children and rarely occurs in adults who are not on dialysis. Some Staphylococcus strains produce exfoliative toxins A and B, which are serine proteases that target and cleave desmoglein 1, a mediator of keratinocyte adhesion. Staphylococcal scalded skin syndrome initially presents with erythema accentuated in the skin folds that becomes generalized. The disruption of keratinocyte adhesion leads to bullae formation in areas of erythema and diffuse sheetlike desquamation. Pathology reveals subcorneal rather than subepidermal blistering, which is seen in GBFDE and SJS/TEN. Treatment involves antistaphylococcal antibiotics and supportive care. With proper treatment, most cases resolve within 2 to 3 weeks.⁷

Mycoplasma pneumoniae–induced rash and mucositis presents with prominent mucositis and can have cutaneous findings of sparse vesiculobullous or targetoid eruption.⁸ Mycoplasma pneumoniae typically infects the lungs and is a leading cause of community-acquired pneumonia. However, a subset of patients can have extrapulmonary disease presenting as mucocutaneous eruptions, which is preceded by an approximately weeklong prodrome of fever, cough, and malaise.⁷ Mycoplasma pneumoniae–induced rash and mucositis also affect children and young patients and is more common in males.⁸

The Diagnosis: Generalized Bullous Fixed Drug Eruption

A punch biopsy from the left thigh revealed a vacuolar interface dermatitis with full-thickness necrosis of the epidermis and a patchy lichenoid inflammatory cell infiltrate in the superficial dermis consistent with a generalized bullous fixed drug eruption (GBFDE). The patient received supportive care and methylprednisolone with improvement of symptoms.

Generalized bullous fixed drug eruption is a rare, potentially life-threatening form of a fixed drug eruption (FDE), a cutaneous drug reaction that occurs in response to a causative medication. It typically presents with welldemarcated, dusky, erythematous patches or plaques that recur in the same sites with repeat exposure.¹ The pathogenesis of FDE has been hypothesized to involve epidermal CD8+ T cells, which are activated by drug exposure and release cytotoxic molecules including Fas, Fas ligand, perforin, and granzyme B, resulting in lysis of the surrounding keratinocytes.^1-3 Common eliciting drugs include nonsteroidal anti-inflammatory drugs, antibacterial agents (particularly trimethoprim-sulfamethoxazole), barbiturates, acetaminophen, and antimalarials.1 In addition to the findings seen in FDE, GBFDE is characterized by widespread bullous skin lesions.^1-4 Typical histologic patterns seen in GBFDE are dispersed epidermal apoptotic keratinocytes, prominent dermal eosinophilic and lymphocytic infiltrates, and dermal melanophages.³ Discontinuing the causative agent and diligent prevention of re-exposure are the most important steps in management, as additional exposures can increase the number of lesions and overall severity. Symptoms typically resolve 7 to 14 days after drug discontinuation, often with postinflammatory hyperpigmentation.³

Generalized bullous fixed drug eruption presents a diagnostic challenge, as it sometimes involves the oral mucosa and can exhibit the Nikolsky sign. Thus, it often is confused with Stevens-Johnson syndrome (SJS) or toxic epidermal necrolysis (TEN).^1,4 Stevens-Johnson syndrome and TEN are severe cutaneous drug eruptions that also can present with diffuse bullous skin lesions. Stevens-Johnson syndrome and TEN are thought to be a spectrum of the same disease that initially presents with dusky red macules that can coalesce, develop central blistering, and lead to skin detachment.⁵ Stevens-Johnson syndrome is defined as skin detachment of less than 10% body surface area (BSA); TEN is defined as skin detachment of more than 30% BSA. Stevens-Johnson syndrome/TEN overlap syndrome includes skin detachment of 10% to 30% BSA.⁵

Causative medications overlap substantially with GBFDE and include anticonvulsants, sulfa-containing drugs, antibiotics, nonsteroidal anti-inflammatory drugs, and uric acid–lowering agents. The histology of SJS/TEN also is quite similar to GBFDE, and these entities may be indistinguishable without clinical information.⁵ Lee et al¹ found that absence of grouped necrotic keratinocytes (fire flag sign), deep inflammatory infiltrates, notable pigment incontinence, and higher eosinophil counts appear to be more common in GBFDE than SJS/TEN. Constitutional symptoms and mucosal involvement also were more frequent in SJS/TEN.

The timing of clinical presentation and medical history can be useful in differentiating between SJS/TEN and GBFDE. In SJS/TEN, drug exposure typically occurs 1 to 3 weeks before onset of symptoms vs 30 minutes to 24 hours in GBFDE.³ Additionally, a history of similar eruption in the same location is pathognomonic for GBFDE. Although GBFDE has been thought to have a better prognosis than SJS/TEN, more recent data suggest mortality rates may be similar.³ A case-control study found a mortality rate of 22% (13/58) in patients with GBFDE compared to 28% (n=170) in SJS/TEN patients.⁴

Erythema multiforme (EM) is an uncommon immunemediated disorder that typically presents as targetoid lesions with central epidermal necrosis in an acral distribution. Erythema multiforme can arise from a variety of factors, but up to 90% of cases are due to infection, most commonly herpes simplex virus; medications account for less than 10% of cases.⁶ Previously, EM has been thought to be on the same disease spectrum as SJS and TEN. It is now clear that EM is a separate entity with similar mucosal erosions but different cutaneous findings,⁶ mainly typical target lesions that differ from the atypical targets seen in SJS.

Staphylococcal scalded skin syndrome is a blistering skin disorder associated with local Staphylococcus aureus infection. It most commonly is seen in children and rarely occurs in adults who are not on dialysis. Some Staphylococcus strains produce exfoliative toxins A and B, which are serine proteases that target and cleave desmoglein 1, a mediator of keratinocyte adhesion. Staphylococcal scalded skin syndrome initially presents with erythema accentuated in the skin folds that becomes generalized. The disruption of keratinocyte adhesion leads to bullae formation in areas of erythema and diffuse sheetlike desquamation. Pathology reveals subcorneal rather than subepidermal blistering, which is seen in GBFDE and SJS/TEN. Treatment involves antistaphylococcal antibiotics and supportive care. With proper treatment, most cases resolve within 2 to 3 weeks.⁷

Mycoplasma pneumoniae–induced rash and mucositis presents with prominent mucositis and can have cutaneous findings of sparse vesiculobullous or targetoid eruption.⁸ Mycoplasma pneumoniae typically infects the lungs and is a leading cause of community-acquired pneumonia. However, a subset of patients can have extrapulmonary disease presenting as mucocutaneous eruptions, which is preceded by an approximately weeklong prodrome of fever, cough, and malaise.⁷ Mycoplasma pneumoniae–induced rash and mucositis also affect children and young patients and is more common in males.⁸

The Diagnosis: Generalized Bullous Fixed Drug Eruption

A punch biopsy from the left thigh revealed a vacuolar interface dermatitis with full-thickness necrosis of the epidermis and a patchy lichenoid inflammatory cell infiltrate in the superficial dermis consistent with a generalized bullous fixed drug eruption (GBFDE). The patient received supportive care and methylprednisolone with improvement of symptoms.

Generalized bullous fixed drug eruption is a rare, potentially life-threatening form of a fixed drug eruption (FDE), a cutaneous drug reaction that occurs in response to a causative medication. It typically presents with welldemarcated, dusky, erythematous patches or plaques that recur in the same sites with repeat exposure.¹ The pathogenesis of FDE has been hypothesized to involve epidermal CD8+ T cells, which are activated by drug exposure and release cytotoxic molecules including Fas, Fas ligand, perforin, and granzyme B, resulting in lysis of the surrounding keratinocytes.^1-3 Common eliciting drugs include nonsteroidal anti-inflammatory drugs, antibacterial agents (particularly trimethoprim-sulfamethoxazole), barbiturates, acetaminophen, and antimalarials.1 In addition to the findings seen in FDE, GBFDE is characterized by widespread bullous skin lesions.^1-4 Typical histologic patterns seen in GBFDE are dispersed epidermal apoptotic keratinocytes, prominent dermal eosinophilic and lymphocytic infiltrates, and dermal melanophages.³ Discontinuing the causative agent and diligent prevention of re-exposure are the most important steps in management, as additional exposures can increase the number of lesions and overall severity. Symptoms typically resolve 7 to 14 days after drug discontinuation, often with postinflammatory hyperpigmentation.³

Generalized bullous fixed drug eruption presents a diagnostic challenge, as it sometimes involves the oral mucosa and can exhibit the Nikolsky sign. Thus, it often is confused with Stevens-Johnson syndrome (SJS) or toxic epidermal necrolysis (TEN).^1,4 Stevens-Johnson syndrome and TEN are severe cutaneous drug eruptions that also can present with diffuse bullous skin lesions. Stevens-Johnson syndrome and TEN are thought to be a spectrum of the same disease that initially presents with dusky red macules that can coalesce, develop central blistering, and lead to skin detachment.⁵ Stevens-Johnson syndrome is defined as skin detachment of less than 10% body surface area (BSA); TEN is defined as skin detachment of more than 30% BSA. Stevens-Johnson syndrome/TEN overlap syndrome includes skin detachment of 10% to 30% BSA.⁵

Causative medications overlap substantially with GBFDE and include anticonvulsants, sulfa-containing drugs, antibiotics, nonsteroidal anti-inflammatory drugs, and uric acid–lowering agents. The histology of SJS/TEN also is quite similar to GBFDE, and these entities may be indistinguishable without clinical information.⁵ Lee et al¹ found that absence of grouped necrotic keratinocytes (fire flag sign), deep inflammatory infiltrates, notable pigment incontinence, and higher eosinophil counts appear to be more common in GBFDE than SJS/TEN. Constitutional symptoms and mucosal involvement also were more frequent in SJS/TEN.

The timing of clinical presentation and medical history can be useful in differentiating between SJS/TEN and GBFDE. In SJS/TEN, drug exposure typically occurs 1 to 3 weeks before onset of symptoms vs 30 minutes to 24 hours in GBFDE.³ Additionally, a history of similar eruption in the same location is pathognomonic for GBFDE. Although GBFDE has been thought to have a better prognosis than SJS/TEN, more recent data suggest mortality rates may be similar.³ A case-control study found a mortality rate of 22% (13/58) in patients with GBFDE compared to 28% (n=170) in SJS/TEN patients.⁴

Erythema multiforme (EM) is an uncommon immunemediated disorder that typically presents as targetoid lesions with central epidermal necrosis in an acral distribution. Erythema multiforme can arise from a variety of factors, but up to 90% of cases are due to infection, most commonly herpes simplex virus; medications account for less than 10% of cases.⁶ Previously, EM has been thought to be on the same disease spectrum as SJS and TEN. It is now clear that EM is a separate entity with similar mucosal erosions but different cutaneous findings,⁶ mainly typical target lesions that differ from the atypical targets seen in SJS.

Staphylococcal scalded skin syndrome is a blistering skin disorder associated with local Staphylococcus aureus infection. It most commonly is seen in children and rarely occurs in adults who are not on dialysis. Some Staphylococcus strains produce exfoliative toxins A and B, which are serine proteases that target and cleave desmoglein 1, a mediator of keratinocyte adhesion. Staphylococcal scalded skin syndrome initially presents with erythema accentuated in the skin folds that becomes generalized. The disruption of keratinocyte adhesion leads to bullae formation in areas of erythema and diffuse sheetlike desquamation. Pathology reveals subcorneal rather than subepidermal blistering, which is seen in GBFDE and SJS/TEN. Treatment involves antistaphylococcal antibiotics and supportive care. With proper treatment, most cases resolve within 2 to 3 weeks.⁷

Mycoplasma pneumoniae–induced rash and mucositis presents with prominent mucositis and can have cutaneous findings of sparse vesiculobullous or targetoid eruption.⁸ Mycoplasma pneumoniae typically infects the lungs and is a leading cause of community-acquired pneumonia. However, a subset of patients can have extrapulmonary disease presenting as mucocutaneous eruptions, which is preceded by an approximately weeklong prodrome of fever, cough, and malaise.⁷ Mycoplasma pneumoniae–induced rash and mucositis also affect children and young patients and is more common in males.⁸

To the Editor:

Broader availability and utilization of novel biologic treatments has heralded the emergence of unusual infections, including skin and soft tissue infections. These unusual infections may not be seen in clinical trials due to their overall rare incidence. In modern society, exposure to unusual pathogens can occur in locations far from their natural habitat.¹ Tissue culture remains the gold standard, as histopathology and smears may not identify the organisms. Tissue culture of these less-common pathogens is challenging and may require multiple samples and specialized laboratory evaluations.² In some cases, a skin biopsy with histopathologic examination is an efficient means to confirm or exclude a dermatologic manifestation of an inflammatory disease. This information can quickly change the course of treatment, especially for those on immunosuppressive medications.³ We report a case of unusual cutaneous infection with Chaetomium globosum in a patient concomitantly treated with vedolizumab, a gut-specific integrin inhibitor, alongside traditional immunosuppressive therapy.

A 33-year-old woman with Crohn disease on vedolizumab and mercaptopurine was referred to the dermatology clinic with firm, tender, erythematous lesions on the legs of 1 month’s duration (Figure, A). She had a history of inflammatory bowel disease with perianal fistula, sacroiliitis, uveitis, guttate psoriasis, and erythema nodosum. She denied recent medication changes, foreign travel, swimming in freshwater or a hot tub, chills, fever, malaise, night sweats, and weight loss. Physical examination revealed several tender, indurated, erythematous plaques across the legs, ranging in size from 4 to 12 cm. The plaques had central hyperpigmentation, atrophy, and scant scale without ulceration, drainage, or pustules. The largest plaque demonstrated a well-defined area of central fluctuance. Prednisone (60 mg) with taper was initiated for presumed recurrence of erythema nodosum with close follow-up.

This case illustrates the importance of a high index of suspicion for unusual infections in the setting of biologic therapy. An infectious etiology of a cutaneous eruption in an immunosuppressed patient should always be included in the differential diagnosis and actively pursued early on; tissue culture may shorten the treatment course and decrease severity of the disease. Although a direct link between the mechanism of action of vedolizumab and cutaneous infection is not clear, given the rare incidence of this infection, a report of such a case is important to the practicing clinician.

To the Editor:

Broader availability and utilization of novel biologic treatments has heralded the emergence of unusual infections, including skin and soft tissue infections. These unusual infections may not be seen in clinical trials due to their overall rare incidence. In modern society, exposure to unusual pathogens can occur in locations far from their natural habitat.¹ Tissue culture remains the gold standard, as histopathology and smears may not identify the organisms. Tissue culture of these less-common pathogens is challenging and may require multiple samples and specialized laboratory evaluations.² In some cases, a skin biopsy with histopathologic examination is an efficient means to confirm or exclude a dermatologic manifestation of an inflammatory disease. This information can quickly change the course of treatment, especially for those on immunosuppressive medications.³ We report a case of unusual cutaneous infection with Chaetomium globosum in a patient concomitantly treated with vedolizumab, a gut-specific integrin inhibitor, alongside traditional immunosuppressive therapy.

A 33-year-old woman with Crohn disease on vedolizumab and mercaptopurine was referred to the dermatology clinic with firm, tender, erythematous lesions on the legs of 1 month’s duration (Figure, A). She had a history of inflammatory bowel disease with perianal fistula, sacroiliitis, uveitis, guttate psoriasis, and erythema nodosum. She denied recent medication changes, foreign travel, swimming in freshwater or a hot tub, chills, fever, malaise, night sweats, and weight loss. Physical examination revealed several tender, indurated, erythematous plaques across the legs, ranging in size from 4 to 12 cm. The plaques had central hyperpigmentation, atrophy, and scant scale without ulceration, drainage, or pustules. The largest plaque demonstrated a well-defined area of central fluctuance. Prednisone (60 mg) with taper was initiated for presumed recurrence of erythema nodosum with close follow-up.

This case illustrates the importance of a high index of suspicion for unusual infections in the setting of biologic therapy. An infectious etiology of a cutaneous eruption in an immunosuppressed patient should always be included in the differential diagnosis and actively pursued early on; tissue culture may shorten the treatment course and decrease severity of the disease. Although a direct link between the mechanism of action of vedolizumab and cutaneous infection is not clear, given the rare incidence of this infection, a report of such a case is important to the practicing clinician.

To the Editor:

Broader availability and utilization of novel biologic treatments has heralded the emergence of unusual infections, including skin and soft tissue infections. These unusual infections may not be seen in clinical trials due to their overall rare incidence. In modern society, exposure to unusual pathogens can occur in locations far from their natural habitat.¹ Tissue culture remains the gold standard, as histopathology and smears may not identify the organisms. Tissue culture of these less-common pathogens is challenging and may require multiple samples and specialized laboratory evaluations.² In some cases, a skin biopsy with histopathologic examination is an efficient means to confirm or exclude a dermatologic manifestation of an inflammatory disease. This information can quickly change the course of treatment, especially for those on immunosuppressive medications.³ We report a case of unusual cutaneous infection with Chaetomium globosum in a patient concomitantly treated with vedolizumab, a gut-specific integrin inhibitor, alongside traditional immunosuppressive therapy.

A 33-year-old woman with Crohn disease on vedolizumab and mercaptopurine was referred to the dermatology clinic with firm, tender, erythematous lesions on the legs of 1 month’s duration (Figure, A). She had a history of inflammatory bowel disease with perianal fistula, sacroiliitis, uveitis, guttate psoriasis, and erythema nodosum. She denied recent medication changes, foreign travel, swimming in freshwater or a hot tub, chills, fever, malaise, night sweats, and weight loss. Physical examination revealed several tender, indurated, erythematous plaques across the legs, ranging in size from 4 to 12 cm. The plaques had central hyperpigmentation, atrophy, and scant scale without ulceration, drainage, or pustules. The largest plaque demonstrated a well-defined area of central fluctuance. Prednisone (60 mg) with taper was initiated for presumed recurrence of erythema nodosum with close follow-up.

This case illustrates the importance of a high index of suspicion for unusual infections in the setting of biologic therapy. An infectious etiology of a cutaneous eruption in an immunosuppressed patient should always be included in the differential diagnosis and actively pursued early on; tissue culture may shorten the treatment course and decrease severity of the disease. Although a direct link between the mechanism of action of vedolizumab and cutaneous infection is not clear, given the rare incidence of this infection, a report of such a case is important to the practicing clinician.

To the Editor:

Verrucous carcinoma is a rare, well-differentiated, locally aggressive squamous cell carcinoma first described by Ackerman in 1948.¹ There are 4 main clinicopathologic types: oral florid papillomatosis or Ackerman tumor, giant condyloma acuminatum or Buschke-Lowenstein tumor, plantar verrucous carcinoma, and cutaneous verrucous carcinoma.^2,3 Historically, most patients are older white men. The lesion commonly occurs in sites of inflammation⁴ or chronic irritation/trauma. Clinically, patients present with a slowly enlarging, exophytic, verrucous plaque violating the skin, fascia, and occasionally bone. Although these lesions have little tendency to metastasize, substantial morbidity can be seen due to local invasion. Despite surgical excision, recurrence is not uncommon and is associated with a poor prognosis and higher infiltrative potential.⁵

A 45-year-old male veteran initially presented to our dermatology clinic with a 4-cm, macerated, verrucous plaque on the left lateral ankle in the area of a skin graft placed during a prior limb salvage surgery (Figure 1). The patient experienced a traumatic blast injury while deployed 7 years prior with a subsequent right-sided below-the-knee amputation and left lower limb salvage. The lesion was clinically diagnosed as verruca vulgaris and treated with daily salicylic acid. Six weeks after the initial presentation, the lesion remained largely unchanged. A biopsy subsequently was obtained to confirm the diagnosis. At that time, the histopathology was consistent with verruca vulgaris without evidence of carcinoma. Due to the persistence of the lesion, lack of improvement with topical treatment, and overall size, the patient opted for surgical excision.

Verrucous carcinoma can represent a diagnostic dilemma, as histologic sections may mimic benign entities. The features of a well-differentiated squamous epithelium with hyperkeratosis, papillomatosis, and acanthosis can be mistaken for verruca vulgaris, keratoacanthoma, and pseudoepitheliomatous hyperplasia,⁶ which are characteristic of verrucous hyperplasia. Accurate diagnosis can be difficult with a superficial biopsy because of the mature appearance of the epithelium,⁷ prompting the need for multiple and deeper biopsies⁸ to include sampling of the base of the hyperplastic epithelium in which the characteristic bulbous pushing growth pattern of the rete ridges is visualized. Precise histologic diagnosis can be further confounded by external mechanical factors, such as pressure, which can distort the classic histopathology.⁷ The histopathologic features leading to the diagnosis of verrucous carcinoma in our specimen were minimal squamous atypia present in a predominantly exophytic squamous proliferation with human papillomavirus cytopathic effect and focal endophytic pushing borders by rounded bulbous rete ridges into the mid and deep dermis (Figure 2).

To the Editor:

Verrucous carcinoma is a rare, well-differentiated, locally aggressive squamous cell carcinoma first described by Ackerman in 1948.¹ There are 4 main clinicopathologic types: oral florid papillomatosis or Ackerman tumor, giant condyloma acuminatum or Buschke-Lowenstein tumor, plantar verrucous carcinoma, and cutaneous verrucous carcinoma.^2,3 Historically, most patients are older white men. The lesion commonly occurs in sites of inflammation⁴ or chronic irritation/trauma. Clinically, patients present with a slowly enlarging, exophytic, verrucous plaque violating the skin, fascia, and occasionally bone. Although these lesions have little tendency to metastasize, substantial morbidity can be seen due to local invasion. Despite surgical excision, recurrence is not uncommon and is associated with a poor prognosis and higher infiltrative potential.⁵

A 45-year-old male veteran initially presented to our dermatology clinic with a 4-cm, macerated, verrucous plaque on the left lateral ankle in the area of a skin graft placed during a prior limb salvage surgery (Figure 1). The patient experienced a traumatic blast injury while deployed 7 years prior with a subsequent right-sided below-the-knee amputation and left lower limb salvage. The lesion was clinically diagnosed as verruca vulgaris and treated with daily salicylic acid. Six weeks after the initial presentation, the lesion remained largely unchanged. A biopsy subsequently was obtained to confirm the diagnosis. At that time, the histopathology was consistent with verruca vulgaris without evidence of carcinoma. Due to the persistence of the lesion, lack of improvement with topical treatment, and overall size, the patient opted for surgical excision.

Verrucous carcinoma can represent a diagnostic dilemma, as histologic sections may mimic benign entities. The features of a well-differentiated squamous epithelium with hyperkeratosis, papillomatosis, and acanthosis can be mistaken for verruca vulgaris, keratoacanthoma, and pseudoepitheliomatous hyperplasia,⁶ which are characteristic of verrucous hyperplasia. Accurate diagnosis can be difficult with a superficial biopsy because of the mature appearance of the epithelium,⁷ prompting the need for multiple and deeper biopsies⁸ to include sampling of the base of the hyperplastic epithelium in which the characteristic bulbous pushing growth pattern of the rete ridges is visualized. Precise histologic diagnosis can be further confounded by external mechanical factors, such as pressure, which can distort the classic histopathology.⁷ The histopathologic features leading to the diagnosis of verrucous carcinoma in our specimen were minimal squamous atypia present in a predominantly exophytic squamous proliferation with human papillomavirus cytopathic effect and focal endophytic pushing borders by rounded bulbous rete ridges into the mid and deep dermis (Figure 2).

To the Editor:

Verrucous carcinoma is a rare, well-differentiated, locally aggressive squamous cell carcinoma first described by Ackerman in 1948.¹ There are 4 main clinicopathologic types: oral florid papillomatosis or Ackerman tumor, giant condyloma acuminatum or Buschke-Lowenstein tumor, plantar verrucous carcinoma, and cutaneous verrucous carcinoma.^2,3 Historically, most patients are older white men. The lesion commonly occurs in sites of inflammation⁴ or chronic irritation/trauma. Clinically, patients present with a slowly enlarging, exophytic, verrucous plaque violating the skin, fascia, and occasionally bone. Although these lesions have little tendency to metastasize, substantial morbidity can be seen due to local invasion. Despite surgical excision, recurrence is not uncommon and is associated with a poor prognosis and higher infiltrative potential.⁵

A 45-year-old male veteran initially presented to our dermatology clinic with a 4-cm, macerated, verrucous plaque on the left lateral ankle in the area of a skin graft placed during a prior limb salvage surgery (Figure 1). The patient experienced a traumatic blast injury while deployed 7 years prior with a subsequent right-sided below-the-knee amputation and left lower limb salvage. The lesion was clinically diagnosed as verruca vulgaris and treated with daily salicylic acid. Six weeks after the initial presentation, the lesion remained largely unchanged. A biopsy subsequently was obtained to confirm the diagnosis. At that time, the histopathology was consistent with verruca vulgaris without evidence of carcinoma. Due to the persistence of the lesion, lack of improvement with topical treatment, and overall size, the patient opted for surgical excision.

Verrucous carcinoma can represent a diagnostic dilemma, as histologic sections may mimic benign entities. The features of a well-differentiated squamous epithelium with hyperkeratosis, papillomatosis, and acanthosis can be mistaken for verruca vulgaris, keratoacanthoma, and pseudoepitheliomatous hyperplasia,⁶ which are characteristic of verrucous hyperplasia. Accurate diagnosis can be difficult with a superficial biopsy because of the mature appearance of the epithelium,⁷ prompting the need for multiple and deeper biopsies⁸ to include sampling of the base of the hyperplastic epithelium in which the characteristic bulbous pushing growth pattern of the rete ridges is visualized. Precise histologic diagnosis can be further confounded by external mechanical factors, such as pressure, which can distort the classic histopathology.⁷ The histopathologic features leading to the diagnosis of verrucous carcinoma in our specimen were minimal squamous atypia present in a predominantly exophytic squamous proliferation with human papillomavirus cytopathic effect and focal endophytic pushing borders by rounded bulbous rete ridges into the mid and deep dermis (Figure 2).