A benign adnexal skin tumor showing sebaceous and hair differentiation occurring in an 84-year-old man is reported. Such a tumor may be called a sebotrichoma. Source of support None Report of a case An 84-year-old white man presented with an enlarging, painless skin mass localized to the left side of his neck. There were no other symptoms or any other skin lesions. His past medical history was unremarkable and there was no history of systemic cancer.The biopsied skin lesion showed a dermal mass composed of a well circumscribed, encapsulated benign lobular proliferation of sebaceous glands peripherally rimmed by basaloid cells with well differentiated sebaceous cells in the central portion of the lobules. There were several foci of duct-like structures with luminal lining by keratinous tissue consistent with hair (follicular) differentiation (Figures 1 and 2).
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