Acne isolated within a Becker nevus of a 14 year-old girl.

Becker nevus (BN) is a common benign condition occurring most often in young men, much more often than in women. Acne isolated within a BN is a rare phenomenon hypothesized to occur, at least in part, due to increased androgen sensitivity within the nevus. We present a rare case of papular acne with in a BN of a 14 year-old girl.