A 24-year-old man is concerned about a large, hairy "mole" on his left shoulder. The lesion appeared during adolescence as a group of small, dark blotches. These eventually coalesced into a hyperpigmented patch with hair and acne.

A 24-year-old man is concerned about a large, hairy "mole" on his left shoulder. The lesion appeared during adolescence as a group of small, dark blotches. These eventually coalesced into a hyperpigmented patch with hair and acne.
Would you biopsy this lesion?
(Case and photo courtesy of Kendall Lane, MD.)
Answer: Becker Nevus
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