DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Lipoma on the right cheek of a 15-year-old boy. This is a benign tumour composed of fatty tissue. It is a painless, harmless soft swelling that may be removed for cosmetic reasons, but is usually left alone unless it inhibits movement or is particularly large. Its cause is unknown.
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