mongolian spot

Mongolian spot is a poorly defined blue-to-gray area of skin discoloration present at birth, usually in the area of the buttocks and lower spine. It may also involve other areas such as the upper back, shoulders, and arms or legs. Palms, soles, and face are spared. The incidence of this birthmark varies according to the overall depth of pigmentation. It is present in 90% or so of black babies, 80% of Asian babies, 65% of Latino babies, and perhaps 5% of white babies. These marks tend to disappear by one to two years of age, although those on the arms or legs may occasionally be permanent. The vague resemblance to a bruise has from time to time led to unfounded accusations of child abuse.

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