title: Congenital subungual nevus.
abstract: A 4-month-old infant with a congenital, darkly pigmented, macular lesion involving the subungual and periungual areas of the right ring finger is described. The lesion was excised when the infant was 6 months old in order to rule out a congenital pigmented nevus as well as a congenital acrolentiginous melanoma. Histopathologic examination revealed a compound nevus. Nevi in this location are very rare in Caucasians at any age and should probably be excised to rule out malignant melanoma.
mesh_terms: D006801:Humans; D007223:Infant; D008297:Male; D009260:Nail Diseases / Q000151:congenital* / Q000473:pathology; D009369:Neoplasms / Q000151:congenital / Q000473:pathology; D009508:Nevus, Pigmented / Q000151:congenital* / Q000473:pathology