DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Compound naevus. Close-up of a compound naevus, or mole, on the skin of a 14-year-old boy. This pigmented naevus is produced by abnormal clustering of pigment cells (melanocytes) in the skin. Naevi are harmless but on rare occasions can become cancerous.
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