Melanocytes and Moles
Melanocytes produce melanin,
the pigment that gives skin its natural color.
When skin is exposed to the sun, melanocytes produce more pigment,
causing the skin to tan, or darken.
Sometimes, clusters of melanocytes and surrounding
tissue
form noncancerous growths called
moles.
(Doctors also call a mole a nevus;
the plural is nevi.) Moles are very
common. Most people have between 10 and
40 moles. Moles may be pink, tan,
brown, or a color that is very close to the person’s normal skin tone. People who have dark skin tend to have dark
moles. Moles can be flat or
raised. They are usually round or oval
and smaller than a pencil eraser. They
may be present at birth or may appear later on—usually before age 40. They tend to fade away in older people. When moles are surgically removed, they normally
do not return.
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