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A papule can be flesh colored, yellow, white, brown, black, blue or purplish, or varying shades of red. [4] [6] The intensity of redness might indicate how long the papule has been present. [6] There may be just one or many, and they may occur irregularly in different parts of the body or appear in clusters. [2] It may progress to a pustule or ...
The skin of the face is thicker than the skin overlying the lips where blood vessels are closer to the surface. As a consequence, the margin of the lips shows a transition between the thicker and thinner skin, represented by the vermilion border. It therefore has the appearance of a sharp line between the coloured edge of the lip and adjoining ...
One average square inch (6.5 cm 2) of skin holds 650 sweat glands, 20 blood vessels, 60,000 melanocytes, and more than 1,000 nerve endings. [5] [better source needed] The average human skin cell is about 30 μm in diameter, but there are variants. A skin cell usually ranges from 25 to 40 μm 2, depending on a variety of factors.
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Melanocytes are melanin-producing neural crest-derived [3] cells located in the bottom layer (the stratum basale) of the skin's epidermis, the middle layer of the eye (the uvea), [4] the inner ear, [5] vaginal epithelium, [6] meninges, [7] bones, [8] and heart found in many mammals and birds. [9] Melanin is a dark pigment primarily responsible ...
Scalp folliculitis is a skin condition that occurs when the hair follicles on the scalp become inflamed. ... Small, itchy bumps: These may be red, white, or yellow and can appear around the hair ...
Identifying human races in terms of skin colour, at least as one among several physiological characteristics, has been common since antiquity.Such divisions appeared in early modern scholarship, usually dividing humankind into four or five categories, with colour-based labels: red, yellow, black, white, and sometimes brown.
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