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A 19-day-old boy presented an ulcer with erythematous and elevated borders in the superior back (figure 1). The lesion was present at birth and the boy was otherwise healthy. The diagnostic hypothesis included xanthogranuloma, Langerhans cell histiocitosis, mastocytoma, leukaemia cutis and congenital infections. A punch biopsy was performed and the microscopic analysis revealed a dermal–epidermal infiltrate of numerous histiocytes, …
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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