title: A mistake I made from which I learned much: melanoma in a preexisting congenital nevus of Unna's type.
authors.affiliation: Ackerman Academy of Dermatopathology, New York City, USA.
authors.forename: A Bernard
authors.initials: AB
authors.lastname: Ackerman
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D006801:Humans; D008545:Melanoma / Q000150:complications* / Q000473:pathology*; D009506:Nevus / Q000150:complications* / Q000473:pathology*; D012878:Skin Neoplasms / Q000150:complications / Q000473:pathology