A 35-year-old male, skin phototype IV, presented with a5-year history of a nail alteration of his right thumb. Hedenied previous trauma, pain or discomfort. The clinicalexamination found an erythronychia associated withsome long filiform haemorrhages on the distal part ofthe nail (Fig. 1). In dermoscopy, the pink band measured1.7 mm, it interrupted the lunula and we clearlydistinguished filiform haemorrhages (Fig. 2a). Thedermatoscopy of the distal edge demonstrated localizedsubunal hyperkeratosis (Fig. 2b). There was no painfularea on palpation. The evaluation of the other fingernailsand toenails was normal. Partial surgical avulsion ofthe nail plate revealed a tumor and a total excision wasmade. We proceeded to a histological examinationthat revealed a papillomatous epithelial lining (Fig. 3),the seat of epidermal metaplasia with the presence ofa keratogenous pseudo-layer. The keratinocytes weremultinucleate without cytonuclear atypia. The diagnosisof onychopapilloma has been established.
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