Search results
Results from the WOW.Com Content Network
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 December 2024. "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 ...
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.
Leucism (/ ˈ l uː s ɪ z əm,-k ɪ z-/) [2] [3] [4] is a wide variety of conditions that result in partial loss of pigmentation in an animal—causing white, pale, or patchy coloration of the skin, hair, feathers, scales, or cuticles, but not the eyes. [4] It is occasionally spelled leukism.
Variations in skin color, due to the levels of melanin, are caused by at least 25 different genes, and variations evolved independently of each other to meet different environmental needs. [76] Over the millennia, human skin colors have evolved to be well-suited to their local environments.
In short, melasma is a chronic skin condition that appears as darkened areas on the face due to an overproduction of melanin, says Gina Charles, MO, a family physician specializing in skincare. It ...
The phenotypic color variation observed in the epidermis and hair of mammals is primarily determined by the levels of eumelanin and pheomelanin in the examined tissue. In an average human individual, eumelanin is more abundant in tissues requiring photoprotection , such as the epidermis and the retinal pigment epithelium . [ 4 ]
Human skin shows higher variation in colour than any other single mammalian species and is the result of natural selection. Skin pigmentation in humans evolved to primarily regulate the amount of ultraviolet radiation (UVR) penetrating the skin, controlling its biochemical effects. [20]
Light skin is a human skin color that has ... light skin is prevalent. [59] The gene variation's primary ... underlying cause. Light-coloured skin has been suspected ...