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Several chemicals have been shown to be effective in skin whitening, while some have proven to be toxic or have questionable safety profiles. This includes mercury compounds which may cause neurological problems and kidney problems. [1] In a number of African countries, between 25 and 80% of women regularly use skin whitening products. [2]
Many forms of hyperpigmentation are caused by an excess production of melanin. [4] Hyperpigmentation can be diffuse or focal, affecting such areas as the face and the back of the hands. Melanin is produced by melanocytes at the lower layer of the epidermis. Melanin is a class of pigment responsible for producing color in the body in places such ...
It's a common skin condition that causes dark patches to appear on the face, usually the forehead, cheeks, nose, and chin, says Dr. Ife Rodney, MD, a board-certified dermatologist and founding ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 14 January 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 ...
Melanin is the primary determinant of the degree of skin pigmentation and protects the body from harmful ultraviolet radiation. The same ultraviolet radiation is essential for the synthesis of vitamin D in skin, so lighter colored skin – less melanin – is an adaptation related to the prehistoric movement of humans away from equatorial ...
The reason for this, is the pigment melanin, which also determines are hair and skin color. So melanin only really has one shade: brown! The more melanin you have in the iris of your eye, the ...
Gray or white hair occurs from a loss of melanin, the pigment which gives the hair color. Melanin is produced by the hair follicles, the structures in the skin which hair grows from, per the NIH .
MCH is a cyclic 19-amino acid neuropeptide, as it is a polypeptide chain that is able to act as a neurotransmitter.MCH neurons are mainly concentrated in the lateral hypothalamic area, zona incerta, and the incerto-hypothalamic area, but they are also located, in much smaller amounts, in the paramedian pontine reticular formation (PPRF), medial preoptic area, laterodorsal tegmental nucleus ...