Basal Cell Carcinoma on a Nevus Sebaceous of Jadassohn

We report the case of a 68-year-old women with a yellowish plaque located in the left temporal region since birth, without any medical follow-up. She reported a change of the lesion with appearance of an ulceration developed 6 months ago. A physical examination revealed a warty plaque measuring 56* 45 mm with an ulceration at the lower part of the lesion shown in Figure 1. Local alopecia was present. Dermoscopy found a pinkish-yellowish plaque with a fiat mamillonated surface, shiny white to red areas, short fine telangiectasia, arborizing vessels and large blue-gray ovoid nests shown in Figure 2. The rest of the clinical examination was normal. The whole evoked the secondary appearance of a BCC developed in a sebaceous nevus.