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A Mongolian spot, also known as slate grey nevus or congenital dermal melanocytosis, is a benign, flat, congenital birthmark with wavy borders and an irregular shape. In 1883, it was described and named after Mongolians by Erwin Bälz, a German anthropologist based in Japan, who erroneously believed it to be most prevalent among his Mongolian patients.
A little over 1 in 10 babies have a vascular birthmark present by age 1. [2] Several birthmark types are part of the group of skin lesions known as nevi or naevi, which is Latin for "birthmarks". Birthmarks occur as a result of a localized imbalance in factors controlling the development and migration of skin cells.
This is an accepted version of this page This is the latest accepted revision, reviewed on 11 February 2025. "Skin pigmentation" redirects here. For animal skin pigmentation, see Biological pigment. Extended Coloured family from South Africa showing some spectrum of human skin coloration Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among ...
The man seated left is a Zuni with albinism. The Zuni people and other indigenous tribes of the American Southwest have a very high incidence of albinism. [33] In some Native American and South Pacific cultures, people with albinism have been traditionally revered, because they were considered heavenly beings associated with the sky.
A woman with dark skin. Dark skin is a type of human skin color that is rich in melanin pigments. [1] [2] [3] People with dark skin are often referred to as black people, [4] although this usage can be ambiguous in some countries where it is also used to specifically refer to different ethnic groups or populations.
They then showed them 196 graphically-generated composites depicting faces with varying gradients of Caucasian and Asian features ranging from 100% Caucasian to 100% Asian and several degrees in ...
A number of countries also do not collect any estimates on the ethnic composition of their population (like France) and the ethnic composition of the population is of high political sensitivity in many countries, which is why reliable data are not available for many countries.
In 1854, Josiah C. Nott with George Gliddon set out to prove "that the Caucasian or white, and the Negro races were distinct at a very remote date, and that the Egyptians were Caucasians." [27] Samuel George Morton, a physician and professor of anatomy, concluded that "Negroes were numerous in Egypt, but their social position in ancient times ...