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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 ...
Anatomy of the human anus. Frontal section. The anus is the final part of the gastrointestinal tract, and directly continues from the rectum, passing through the pelvic floor. The top and bottom of the anus are surrounded by the internal and external anal sphincters, two muscular rings which control defecation.
The first modern humans had darker skin as the indigenous people of Africa today. Following migration and settlement in Asia and Europe, the selective pressure dark UV-radiation protecting skin decreased where radiation from the sun was less intense. This resulted in the current range of human skin color.
During this process, a lamp that uses long-wave ultraviolet (UV) light will make certain cells show color or appear fluorescent, according to the Cleveland Clinic. Doctors also take time during ...
Melanism is the congenital excess of melanin in an organism resulting in dark pigment. Pseudomelanism, also called abundism, is another variant of pigmentation, identifiable by dark spots or enlarged stripes, which cover a large part of the body of the animal, making it appear melanistic. [2]
Anal sac fluid varies from yellow to tan or brown in color. The consistency of the fluid ranges from thin, watery secretions to thick, gritty paste. There can also be a range in the malodorousness, or how strongly the contents smell. [14] These factors can all be different from animal to animal. [14]
Blackheads (open comedones): Blackheads are small dark brown or black spots, often on the nose and chin. They happen when pores are clogged with sebum and dead skin cells, and are open at the surface.
Pornographic film actresses were the first to undergo the anal bleaching process, in an effort to lighten the color of their anuses to match the rest of their skin. [1] As Brazilian waxing became popular, due to the popularity of smaller swimsuits and lingerie, the spread of pornography into the mainstream, and endorsement of the procedure by celebrities, [2] women began noticing that their ...