In the lower epidermis, melanocytes produce melanin, the pigment that gives
skin its color. Exposed to the sun, melanocyes make more pigment causing skin to
darken.
Unrepaired DNA damages skin cells triggering mutations, causing skin cells
to multiply rapidly and form malignant tumors. Curable if detected early,
but each year in the U.S. ~10,000 people die of this type of cancer.
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