Linear unilateral basal cell nevus: a benign follicular hamartoma simulating multiple basal cell carcinomas.

We report a case of linear unilateral basal cell nevus (LBCN) occurring on the left lateral neck and left posterior shoulder of a 23-year-old woman. LBCN is a rare benign follicular hamartoma that must be distinguished from the more aggressive unilateral and segmental variant of nevoid basal cell carcinoma syndrome (NBCCS) and the linear variant of BCC.