title: Pigmented keratoacanthoma.
mesh_terms: D000328:Adult; D005148:Facial Dermatoses / Q000473:pathology*; D006801:Humans; D007636:Keratoacanthoma / Q000473:pathology*; D008297:Male; D008544:Melanocytes / Q000473:pathology; D014983:Xeroderma Pigmentosum / Q000150:complications