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Erythematous Flaky Rash on the Toe

The Diagnosis: Necrolytic Migratory Erythema

Necrolytic migratory erythema (NME) is a waxing and waning rash associated with rare pancreatic neuroendocrine tumors called glucagonomas. It is characterized by pruritic and painful, well-demarcated, erythematous plaques that manifest in the intertriginous areas and on the perineum and buttocks.1 Due to the evolving nature of the rash, the histopathologic findings in NME vary depending on the stage of the cutaneous lesions at the time of biopsy.2 Multiple dyskeratotic keratinocytes spanning all epidermal layers may be a diagnostic clue in early lesions of NME.3 Typical features of longstanding lesions include confluent parakeratosis, psoriasiform hyperplasia with mild or absent spongiosis, and upper epidermal necrosis with keratinocyte vacuolization and pallor.4 Morphologic features that are present prior to the development of epidermal vacuolation and necrosis frequently are misattributed to psoriasis or eczema. Long-standing lesions also may develop a neutrophilic infiltrate with subcorneal and intraepidermal pustules.2 Other common features include a discrete perivascular lymphocytic infiltrate and an erosive or encrusted epidermis.5 Although direct immunofluorescence typically is negative, nonspecific findings can be seen, including apoptotic keratinocytes labeling with fibrinogen and C3, as well as scattered, clumped, IgM-positive cytoid bodies present at the dermal-epidermal junction (DEJ).6 Biopsies also have shown scattered, clumped, IgM-positive cytoid bodies present at the DEJ.5

Psoriasis is a chronic relapsing papulosquamous disorder characterized by scaly erythematous plaques often overlying the extensor surfaces of the extremities. Histopathology shows a psoriasiform pattern of inflammation with thinning of the suprapapillary plates and elongation of the rete ridges. Further diagnostic clues of psoriasis include regular acanthosis, characteristic Munro microabscesses with neutrophils in a hyperkeratotic stratum corneum (Figure 1), hypogranulosis, and neutrophilic spongiform pustules of Kogoj in the stratum spinosum. Generally, there is a lack of the epidermal necrosis seen with NME.7,8

Lichen simplex chronicus manifests as pruritic, often hyperpigmented, well-defined, lichenified plaques with excoriation following repetitive mechanical trauma, commonly on the lower lateral legs, posterior neck, and flexural areas.9 The histologic landscape is marked by well-developed lesions evolving to show compact orthokeratosis, hypergranulosis, irregularly elongated rete ridges (ie, irregular acanthosis), and papillary dermal fibrosis with vertical streaking of collagen (Figure 2).9,10

Subacute cutaneous lupus erythematosus (SCLE) is recognized clinically by scaly/psoriasiform and annular lesions with mild or absent systemic involvement. Common histopathologic findings include epidermal atrophy, vacuolar interface dermatitis with hydropic degeneration of the basal layer, a subepidermal lymphocytic infiltrate, and a periadnexal and perivascular infiltrate (Figure 3).11 Upper dermal edema, spotty necrosis of individual cells in the epidermis, dermal-epidermal separation caused by prominent basal cell degeneration, and accumulation of acid mucopolysaccharides (mucin) are other histologic features associated with SCLE.12,13

FIGURE 1. Psoriasis shows hyperkeratosis with neutrophils in the stratum corneum on histopathology (H&E, original magnification ×40).

FIGURE 2. Lichen simplex chronicus shows a compact stratum corneum, irregular acanthosis, and papillary dermal fibrosis on biopsy (H&E, original magnification ×10).

The immunofluorescence pattern in SCLE features dustlike particles of IgG deposition in the epidermis, subepidermal region, and dermal cellular infiltrate. Lesions also may have granular deposition of immunoreactions at the DEJ.11,13

FIGURE 3. Subacute cutaneous lupus erythematosus shows vacuolar interface dermatitis with epidermal atrophy, subepidermal lymphocytes, and perivascular inflammation on biopsy (H&E, original magnification ×10).

FIGURE 4. Drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome shows spongiosis with a perivascular infiltrate on biopsy; eosinophils are variably observed (H&E, original magnification ×10).

The manifestation of drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome (also known as drug-induced hypersensitivity syndrome) is variable, with a morbilliform rash that spreads from the face to the entire body, urticaria, atypical target lesions, purpuriform lesions, lymphadenopathy, and exfoliative dermatitis.14 The nonspecific morphologic features of DRESS syndrome lesions are associated with variable histologic features, which include focal interface changes with vacuolar alteration of the basal layer; atypical lymphocytes with hyperchromic nuclei; and a superficial, inconsistently dense, perivascular lymphocytic infiltrate. Other relatively common histopathologic patterns include an upper dermis with dilated blood vessels, spongiosis with exocytosis of lymphocytes (Figure 4), and necrotic keratinocytes. Although peripheral eosinophilia is an important diagnostic criterion and is observed consistently, eosinophils are variably present on skin biopsy.15,16 Given the histopathologic variability and nonspecific findings, clinical correlation is required when diagnosing DRESS syndrome.

References
  1. Halvorson SA, Gilbert E, Hopkins RS, et al. Putting the pieces together: necrolytic migratory erythema and the glucagonoma syndrome. J Gen Intern Med. 2013;28:1525-1529. doi:10.1007 /s11606-013-2490-5
  2. Toberer F, Hartschuh W, Wiedemeyer K. Glucagonoma-associated necrolytic migratory erythema: the broad spectrum of the clinical and histopathological findings and clues to the diagnosis. Am J Dermatopathol. 2019;41:E29-E32. doi:10.1097DAD .0000000000001219
  3. Hunt SJ, Narus VT, Abell E. Necrolytic migratory erythema: dyskeratotic dermatitis, a clue to early diagnosis. J Am Acad Dermatol. 1991; 24:473-477. doi:10.1016/0190-9622(91)70076-e
  4. van Beek AP, de Haas ER, van Vloten WA, et al. The glucagonoma syndrome and necrolytic migratory erythema: a clinical review. Eur J Endocrinol. 2004;151:531-537. doi:10.1530/eje.0.1510531
  5. Pujol RM, Wang C-Y E, el-Azhary RA, et al. Necrolytic migratory erythema: clinicopathologic study of 13 cases. Int J Dermatol. 2004;43:12- 18. doi:10.1111/j.1365-4632.2004.01844.x
  6. Johnson SM, Smoller BR, Lamps LW, et al. Necrolytic migratory erythema as the only presenting sign of a glucagonoma. J Am Acad Dermatol. 2003;49:325-328. doi:10.1067/s0190-9622(02)61774-8
  7. De Rosa G, Mignogna C. The histopathology of psoriasis. Reumatismo. 2007;59(suppl 1):46-48. doi:10.4081/reumatismo.2007.1s.46
  8. Kimmel GW, Lebwohl M. Psoriasis: overview and diagnosis. In: Bhutani T, Liao W, Nakamura M, eds. Evidence-Based Psoriasis. Springer; 2018:1-16. doi:10.1007/978-3-319-90107-7_1
  9. Balan R, Grigoras¸ A, Popovici D, et al. The histopathological landscape of the major psoriasiform dermatoses. Arch Clin Cases. 2021;6:59-68. doi:10.22551/2019.24.0603.10155
  10. O’Keefe RJ, Scurry JP, Dennerstein G, et al. Audit of 114 nonneoplastic vulvar biopsies. Br J Obstet Gynaecol. 1995;102:780-786. doi:10.1111/j.1471-0528.1995.tb10842.x
  11. Parodi A, Caproni M, Cardinali C, et al P. Clinical, histological and immunopathological features of 58 patients with subacute cutaneous lupus erythematosus. Dermatology. 2000;200:6-10. doi:10.1159/000018307
  12. Lyon CC, Blewitt R, Harrison PV. Subacute cutaneous lupus erythematosus: two cases of delayed diagnosis. Acta Derm Venereol. 1998;78:57-59. doi:10.1080/00015559850135869
  13. David-Bajar KM. Subacute cutaneous lupus erythematosus. J Invest Dermatol. 1993;100:2S-8S. doi:10.1111/1523-1747.ep12355164
  14. Paulmann M, Mockenhaupt M. Severe drug-induced skin reactions: clinical features, diagnosis, etiology, and therapy. J Dtsch Dermatol Ges. 2015;13:625-643. doi:10.1111/ddg.12747
  15. Borroni G, Torti S, Pezzini C, et al. Histopathologic spectrum of drug reaction with eosinophilia and systemic symptoms (DRESS): a diagnosis that needs clinico-pathological correlation. G Ital Dermatol Venereol. 2014;149:291-300.
  16. Ortonne N, Valeyrie-Allanore L, Bastuji-Garin S, et al. Histopathology of drug rash with eosinophilia and systemic symptoms syndrome: a morphological and phenotypical study. Br J Dermatol. 2015;173:50-58. doi:10.1111/bjd.13683
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Sarah K. Friske is from the School of Medicine, Baylor College of Medicine, Houston, Texas. Drs. Wiggins, Carrigg, and Bohlke are from Good Samaritan Health Services/Frontier Derm, Salem, Oregon. Dr. Seervai is from Oregon Health & Science University, Portland.

The authors report no conflict of interest.

Correspondence: Riyad N.H. Seervai, MD, PhD, 3303 S Bond Ave, Bldg 1, Portland, OR 97239 ([email protected]).

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Sarah K. Friske is from the School of Medicine, Baylor College of Medicine, Houston, Texas. Drs. Wiggins, Carrigg, and Bohlke are from Good Samaritan Health Services/Frontier Derm, Salem, Oregon. Dr. Seervai is from Oregon Health & Science University, Portland.

The authors report no conflict of interest.

Correspondence: Riyad N.H. Seervai, MD, PhD, 3303 S Bond Ave, Bldg 1, Portland, OR 97239 ([email protected]).

Author and Disclosure Information

Sarah K. Friske is from the School of Medicine, Baylor College of Medicine, Houston, Texas. Drs. Wiggins, Carrigg, and Bohlke are from Good Samaritan Health Services/Frontier Derm, Salem, Oregon. Dr. Seervai is from Oregon Health & Science University, Portland.

The authors report no conflict of interest.

Correspondence: Riyad N.H. Seervai, MD, PhD, 3303 S Bond Ave, Bldg 1, Portland, OR 97239 ([email protected]).

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The Diagnosis: Necrolytic Migratory Erythema

Necrolytic migratory erythema (NME) is a waxing and waning rash associated with rare pancreatic neuroendocrine tumors called glucagonomas. It is characterized by pruritic and painful, well-demarcated, erythematous plaques that manifest in the intertriginous areas and on the perineum and buttocks.1 Due to the evolving nature of the rash, the histopathologic findings in NME vary depending on the stage of the cutaneous lesions at the time of biopsy.2 Multiple dyskeratotic keratinocytes spanning all epidermal layers may be a diagnostic clue in early lesions of NME.3 Typical features of longstanding lesions include confluent parakeratosis, psoriasiform hyperplasia with mild or absent spongiosis, and upper epidermal necrosis with keratinocyte vacuolization and pallor.4 Morphologic features that are present prior to the development of epidermal vacuolation and necrosis frequently are misattributed to psoriasis or eczema. Long-standing lesions also may develop a neutrophilic infiltrate with subcorneal and intraepidermal pustules.2 Other common features include a discrete perivascular lymphocytic infiltrate and an erosive or encrusted epidermis.5 Although direct immunofluorescence typically is negative, nonspecific findings can be seen, including apoptotic keratinocytes labeling with fibrinogen and C3, as well as scattered, clumped, IgM-positive cytoid bodies present at the dermal-epidermal junction (DEJ).6 Biopsies also have shown scattered, clumped, IgM-positive cytoid bodies present at the DEJ.5

Psoriasis is a chronic relapsing papulosquamous disorder characterized by scaly erythematous plaques often overlying the extensor surfaces of the extremities. Histopathology shows a psoriasiform pattern of inflammation with thinning of the suprapapillary plates and elongation of the rete ridges. Further diagnostic clues of psoriasis include regular acanthosis, characteristic Munro microabscesses with neutrophils in a hyperkeratotic stratum corneum (Figure 1), hypogranulosis, and neutrophilic spongiform pustules of Kogoj in the stratum spinosum. Generally, there is a lack of the epidermal necrosis seen with NME.7,8

Lichen simplex chronicus manifests as pruritic, often hyperpigmented, well-defined, lichenified plaques with excoriation following repetitive mechanical trauma, commonly on the lower lateral legs, posterior neck, and flexural areas.9 The histologic landscape is marked by well-developed lesions evolving to show compact orthokeratosis, hypergranulosis, irregularly elongated rete ridges (ie, irregular acanthosis), and papillary dermal fibrosis with vertical streaking of collagen (Figure 2).9,10

Subacute cutaneous lupus erythematosus (SCLE) is recognized clinically by scaly/psoriasiform and annular lesions with mild or absent systemic involvement. Common histopathologic findings include epidermal atrophy, vacuolar interface dermatitis with hydropic degeneration of the basal layer, a subepidermal lymphocytic infiltrate, and a periadnexal and perivascular infiltrate (Figure 3).11 Upper dermal edema, spotty necrosis of individual cells in the epidermis, dermal-epidermal separation caused by prominent basal cell degeneration, and accumulation of acid mucopolysaccharides (mucin) are other histologic features associated with SCLE.12,13

FIGURE 1. Psoriasis shows hyperkeratosis with neutrophils in the stratum corneum on histopathology (H&E, original magnification ×40).

FIGURE 2. Lichen simplex chronicus shows a compact stratum corneum, irregular acanthosis, and papillary dermal fibrosis on biopsy (H&E, original magnification ×10).

The immunofluorescence pattern in SCLE features dustlike particles of IgG deposition in the epidermis, subepidermal region, and dermal cellular infiltrate. Lesions also may have granular deposition of immunoreactions at the DEJ.11,13

FIGURE 3. Subacute cutaneous lupus erythematosus shows vacuolar interface dermatitis with epidermal atrophy, subepidermal lymphocytes, and perivascular inflammation on biopsy (H&E, original magnification ×10).

FIGURE 4. Drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome shows spongiosis with a perivascular infiltrate on biopsy; eosinophils are variably observed (H&E, original magnification ×10).

The manifestation of drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome (also known as drug-induced hypersensitivity syndrome) is variable, with a morbilliform rash that spreads from the face to the entire body, urticaria, atypical target lesions, purpuriform lesions, lymphadenopathy, and exfoliative dermatitis.14 The nonspecific morphologic features of DRESS syndrome lesions are associated with variable histologic features, which include focal interface changes with vacuolar alteration of the basal layer; atypical lymphocytes with hyperchromic nuclei; and a superficial, inconsistently dense, perivascular lymphocytic infiltrate. Other relatively common histopathologic patterns include an upper dermis with dilated blood vessels, spongiosis with exocytosis of lymphocytes (Figure 4), and necrotic keratinocytes. Although peripheral eosinophilia is an important diagnostic criterion and is observed consistently, eosinophils are variably present on skin biopsy.15,16 Given the histopathologic variability and nonspecific findings, clinical correlation is required when diagnosing DRESS syndrome.

The Diagnosis: Necrolytic Migratory Erythema

Necrolytic migratory erythema (NME) is a waxing and waning rash associated with rare pancreatic neuroendocrine tumors called glucagonomas. It is characterized by pruritic and painful, well-demarcated, erythematous plaques that manifest in the intertriginous areas and on the perineum and buttocks.1 Due to the evolving nature of the rash, the histopathologic findings in NME vary depending on the stage of the cutaneous lesions at the time of biopsy.2 Multiple dyskeratotic keratinocytes spanning all epidermal layers may be a diagnostic clue in early lesions of NME.3 Typical features of longstanding lesions include confluent parakeratosis, psoriasiform hyperplasia with mild or absent spongiosis, and upper epidermal necrosis with keratinocyte vacuolization and pallor.4 Morphologic features that are present prior to the development of epidermal vacuolation and necrosis frequently are misattributed to psoriasis or eczema. Long-standing lesions also may develop a neutrophilic infiltrate with subcorneal and intraepidermal pustules.2 Other common features include a discrete perivascular lymphocytic infiltrate and an erosive or encrusted epidermis.5 Although direct immunofluorescence typically is negative, nonspecific findings can be seen, including apoptotic keratinocytes labeling with fibrinogen and C3, as well as scattered, clumped, IgM-positive cytoid bodies present at the dermal-epidermal junction (DEJ).6 Biopsies also have shown scattered, clumped, IgM-positive cytoid bodies present at the DEJ.5

Psoriasis is a chronic relapsing papulosquamous disorder characterized by scaly erythematous plaques often overlying the extensor surfaces of the extremities. Histopathology shows a psoriasiform pattern of inflammation with thinning of the suprapapillary plates and elongation of the rete ridges. Further diagnostic clues of psoriasis include regular acanthosis, characteristic Munro microabscesses with neutrophils in a hyperkeratotic stratum corneum (Figure 1), hypogranulosis, and neutrophilic spongiform pustules of Kogoj in the stratum spinosum. Generally, there is a lack of the epidermal necrosis seen with NME.7,8

Lichen simplex chronicus manifests as pruritic, often hyperpigmented, well-defined, lichenified plaques with excoriation following repetitive mechanical trauma, commonly on the lower lateral legs, posterior neck, and flexural areas.9 The histologic landscape is marked by well-developed lesions evolving to show compact orthokeratosis, hypergranulosis, irregularly elongated rete ridges (ie, irregular acanthosis), and papillary dermal fibrosis with vertical streaking of collagen (Figure 2).9,10

Subacute cutaneous lupus erythematosus (SCLE) is recognized clinically by scaly/psoriasiform and annular lesions with mild or absent systemic involvement. Common histopathologic findings include epidermal atrophy, vacuolar interface dermatitis with hydropic degeneration of the basal layer, a subepidermal lymphocytic infiltrate, and a periadnexal and perivascular infiltrate (Figure 3).11 Upper dermal edema, spotty necrosis of individual cells in the epidermis, dermal-epidermal separation caused by prominent basal cell degeneration, and accumulation of acid mucopolysaccharides (mucin) are other histologic features associated with SCLE.12,13

FIGURE 1. Psoriasis shows hyperkeratosis with neutrophils in the stratum corneum on histopathology (H&E, original magnification ×40).

FIGURE 2. Lichen simplex chronicus shows a compact stratum corneum, irregular acanthosis, and papillary dermal fibrosis on biopsy (H&E, original magnification ×10).

The immunofluorescence pattern in SCLE features dustlike particles of IgG deposition in the epidermis, subepidermal region, and dermal cellular infiltrate. Lesions also may have granular deposition of immunoreactions at the DEJ.11,13

FIGURE 3. Subacute cutaneous lupus erythematosus shows vacuolar interface dermatitis with epidermal atrophy, subepidermal lymphocytes, and perivascular inflammation on biopsy (H&E, original magnification ×10).

FIGURE 4. Drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome shows spongiosis with a perivascular infiltrate on biopsy; eosinophils are variably observed (H&E, original magnification ×10).

The manifestation of drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome (also known as drug-induced hypersensitivity syndrome) is variable, with a morbilliform rash that spreads from the face to the entire body, urticaria, atypical target lesions, purpuriform lesions, lymphadenopathy, and exfoliative dermatitis.14 The nonspecific morphologic features of DRESS syndrome lesions are associated with variable histologic features, which include focal interface changes with vacuolar alteration of the basal layer; atypical lymphocytes with hyperchromic nuclei; and a superficial, inconsistently dense, perivascular lymphocytic infiltrate. Other relatively common histopathologic patterns include an upper dermis with dilated blood vessels, spongiosis with exocytosis of lymphocytes (Figure 4), and necrotic keratinocytes. Although peripheral eosinophilia is an important diagnostic criterion and is observed consistently, eosinophils are variably present on skin biopsy.15,16 Given the histopathologic variability and nonspecific findings, clinical correlation is required when diagnosing DRESS syndrome.

References
  1. Halvorson SA, Gilbert E, Hopkins RS, et al. Putting the pieces together: necrolytic migratory erythema and the glucagonoma syndrome. J Gen Intern Med. 2013;28:1525-1529. doi:10.1007 /s11606-013-2490-5
  2. Toberer F, Hartschuh W, Wiedemeyer K. Glucagonoma-associated necrolytic migratory erythema: the broad spectrum of the clinical and histopathological findings and clues to the diagnosis. Am J Dermatopathol. 2019;41:E29-E32. doi:10.1097DAD .0000000000001219
  3. Hunt SJ, Narus VT, Abell E. Necrolytic migratory erythema: dyskeratotic dermatitis, a clue to early diagnosis. J Am Acad Dermatol. 1991; 24:473-477. doi:10.1016/0190-9622(91)70076-e
  4. van Beek AP, de Haas ER, van Vloten WA, et al. The glucagonoma syndrome and necrolytic migratory erythema: a clinical review. Eur J Endocrinol. 2004;151:531-537. doi:10.1530/eje.0.1510531
  5. Pujol RM, Wang C-Y E, el-Azhary RA, et al. Necrolytic migratory erythema: clinicopathologic study of 13 cases. Int J Dermatol. 2004;43:12- 18. doi:10.1111/j.1365-4632.2004.01844.x
  6. Johnson SM, Smoller BR, Lamps LW, et al. Necrolytic migratory erythema as the only presenting sign of a glucagonoma. J Am Acad Dermatol. 2003;49:325-328. doi:10.1067/s0190-9622(02)61774-8
  7. De Rosa G, Mignogna C. The histopathology of psoriasis. Reumatismo. 2007;59(suppl 1):46-48. doi:10.4081/reumatismo.2007.1s.46
  8. Kimmel GW, Lebwohl M. Psoriasis: overview and diagnosis. In: Bhutani T, Liao W, Nakamura M, eds. Evidence-Based Psoriasis. Springer; 2018:1-16. doi:10.1007/978-3-319-90107-7_1
  9. Balan R, Grigoras¸ A, Popovici D, et al. The histopathological landscape of the major psoriasiform dermatoses. Arch Clin Cases. 2021;6:59-68. doi:10.22551/2019.24.0603.10155
  10. O’Keefe RJ, Scurry JP, Dennerstein G, et al. Audit of 114 nonneoplastic vulvar biopsies. Br J Obstet Gynaecol. 1995;102:780-786. doi:10.1111/j.1471-0528.1995.tb10842.x
  11. Parodi A, Caproni M, Cardinali C, et al P. Clinical, histological and immunopathological features of 58 patients with subacute cutaneous lupus erythematosus. Dermatology. 2000;200:6-10. doi:10.1159/000018307
  12. Lyon CC, Blewitt R, Harrison PV. Subacute cutaneous lupus erythematosus: two cases of delayed diagnosis. Acta Derm Venereol. 1998;78:57-59. doi:10.1080/00015559850135869
  13. David-Bajar KM. Subacute cutaneous lupus erythematosus. J Invest Dermatol. 1993;100:2S-8S. doi:10.1111/1523-1747.ep12355164
  14. Paulmann M, Mockenhaupt M. Severe drug-induced skin reactions: clinical features, diagnosis, etiology, and therapy. J Dtsch Dermatol Ges. 2015;13:625-643. doi:10.1111/ddg.12747
  15. Borroni G, Torti S, Pezzini C, et al. Histopathologic spectrum of drug reaction with eosinophilia and systemic symptoms (DRESS): a diagnosis that needs clinico-pathological correlation. G Ital Dermatol Venereol. 2014;149:291-300.
  16. Ortonne N, Valeyrie-Allanore L, Bastuji-Garin S, et al. Histopathology of drug rash with eosinophilia and systemic symptoms syndrome: a morphological and phenotypical study. Br J Dermatol. 2015;173:50-58. doi:10.1111/bjd.13683
References
  1. Halvorson SA, Gilbert E, Hopkins RS, et al. Putting the pieces together: necrolytic migratory erythema and the glucagonoma syndrome. J Gen Intern Med. 2013;28:1525-1529. doi:10.1007 /s11606-013-2490-5
  2. Toberer F, Hartschuh W, Wiedemeyer K. Glucagonoma-associated necrolytic migratory erythema: the broad spectrum of the clinical and histopathological findings and clues to the diagnosis. Am J Dermatopathol. 2019;41:E29-E32. doi:10.1097DAD .0000000000001219
  3. Hunt SJ, Narus VT, Abell E. Necrolytic migratory erythema: dyskeratotic dermatitis, a clue to early diagnosis. J Am Acad Dermatol. 1991; 24:473-477. doi:10.1016/0190-9622(91)70076-e
  4. van Beek AP, de Haas ER, van Vloten WA, et al. The glucagonoma syndrome and necrolytic migratory erythema: a clinical review. Eur J Endocrinol. 2004;151:531-537. doi:10.1530/eje.0.1510531
  5. Pujol RM, Wang C-Y E, el-Azhary RA, et al. Necrolytic migratory erythema: clinicopathologic study of 13 cases. Int J Dermatol. 2004;43:12- 18. doi:10.1111/j.1365-4632.2004.01844.x
  6. Johnson SM, Smoller BR, Lamps LW, et al. Necrolytic migratory erythema as the only presenting sign of a glucagonoma. J Am Acad Dermatol. 2003;49:325-328. doi:10.1067/s0190-9622(02)61774-8
  7. De Rosa G, Mignogna C. The histopathology of psoriasis. Reumatismo. 2007;59(suppl 1):46-48. doi:10.4081/reumatismo.2007.1s.46
  8. Kimmel GW, Lebwohl M. Psoriasis: overview and diagnosis. In: Bhutani T, Liao W, Nakamura M, eds. Evidence-Based Psoriasis. Springer; 2018:1-16. doi:10.1007/978-3-319-90107-7_1
  9. Balan R, Grigoras¸ A, Popovici D, et al. The histopathological landscape of the major psoriasiform dermatoses. Arch Clin Cases. 2021;6:59-68. doi:10.22551/2019.24.0603.10155
  10. O’Keefe RJ, Scurry JP, Dennerstein G, et al. Audit of 114 nonneoplastic vulvar biopsies. Br J Obstet Gynaecol. 1995;102:780-786. doi:10.1111/j.1471-0528.1995.tb10842.x
  11. Parodi A, Caproni M, Cardinali C, et al P. Clinical, histological and immunopathological features of 58 patients with subacute cutaneous lupus erythematosus. Dermatology. 2000;200:6-10. doi:10.1159/000018307
  12. Lyon CC, Blewitt R, Harrison PV. Subacute cutaneous lupus erythematosus: two cases of delayed diagnosis. Acta Derm Venereol. 1998;78:57-59. doi:10.1080/00015559850135869
  13. David-Bajar KM. Subacute cutaneous lupus erythematosus. J Invest Dermatol. 1993;100:2S-8S. doi:10.1111/1523-1747.ep12355164
  14. Paulmann M, Mockenhaupt M. Severe drug-induced skin reactions: clinical features, diagnosis, etiology, and therapy. J Dtsch Dermatol Ges. 2015;13:625-643. doi:10.1111/ddg.12747
  15. Borroni G, Torti S, Pezzini C, et al. Histopathologic spectrum of drug reaction with eosinophilia and systemic symptoms (DRESS): a diagnosis that needs clinico-pathological correlation. G Ital Dermatol Venereol. 2014;149:291-300.
  16. Ortonne N, Valeyrie-Allanore L, Bastuji-Garin S, et al. Histopathology of drug rash with eosinophilia and systemic symptoms syndrome: a morphological and phenotypical study. Br J Dermatol. 2015;173:50-58. doi:10.1111/bjd.13683
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A 62-year-old man presented with an erythematous flaky rash associated with burning pain on the right medial second toe that persisted for several months. Prior treatment with econazole, ciclopirox, and oral amoxicillin had failed. A shave biopsy was performed.

H&E, original magnifications ×20.

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