Carcinoma arising in a sebaceous cyst.
D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D004428:Ear Neoplasms / Q000473:pathology*; D004431:Ear, External; D004814:Epidermal Cyst / Q000473:pathology*; D006801:Humans; D008297:Male