No one knows why moles develop or what purpose they serve, if any. However, we do know how they develop.
Melanin, a natural pigment resulting in skin color, is produced in cells called melanocytes, and then transported to the surface cells of the skin. Normally, melanin is distributed evenly, but sometimes melanocytes grow together in a cluster, giving rise to moles.
Most moles are harmless and don't require special care, but some people have unusual-looking moles, called dysplastic nevi, which are more likely to turn cancerous than ordinary moles are.
Atypical moles occur most often on the back in both men and women, and also on the abdomen, chest and legs in women.
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