Dictionary of Human Evolution and Biology

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Congenital Dermal Melanocytosis

Macular bluegray pigmentation, usually in the sacral area of normal infants, due to the entrapment of melanocytes in the dermis during development. Commonly called the sacral spot, Mongolian spot or Mongoloid birthmark because of its high frequency in Asian populations (90%), but it also occurs in high frequency in East Africa (80%), Native Americans and Hispanics (45%), and other groups of humans. It is present at birth and typically disappears within four years.

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