CID, ISM / SCIENCE PHOTO LIBRARY CID, ISM / SCIENCE PHOTO LIBRARY
Becker's naevus. Close-up of lesions on the back and shoulder of a 15-year-old male with Becker's naevus. Most common in males soon after puberty, this harmless condition is caused by an overproduction of skin pigment (melanin) and excessive hair growth (hypertrichosis).
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