Sebaceous carcinoma and basal cell carcinoma arising within nevus sebaceous on the face—A rare entity with dermatoscopic findings

Abstract

Nevus sebaceous (NS) is a benign hamartoma of the skin. Secondary malignant tumors arising in a NS, dominated by basal cell carcinoma (BCC), occurred at a rate of 0.8%. 1 The risk of malignancy increases with age. Other malignant tumors found within NS include squamous cell carcinoma, apocrine, and microcytic adnexal carcinoma and sebaceous carcinoma (SC). 1 The development of multiple tumors within a single nevus sebaceous is rare. 2 Herein, we report an uncommon case of SC and BCC arising in NS with dermatoscopic features.