MID ESSEX HOSPITAL SERVICES NHS TRUST / SCIENCE PHOTO LIBRARY MID ESSEX HOSPITAL SERVICES NHS TRUST / SCIENCE PHOTO LIBRARY
Atypical moles on the back of a 23-year-old man. Moles are caused by an abnormality or proliferation of melanocytes, the skin cells that produce the pigment melanin. Most moles are harmless but they can turn cancerous. Two if these moles have been ringed for further examination and potential removal.
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