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Poliosis circumscripta, commonly referred to as a "white forelock", is a condition characterized by localized patches of white hair due to a reduction or absence of melanin in hair follicles. Although traditionally associated with the scalp, poliosis can affect any hairy area on the body, including eyebrows, eyelashes, and beards.
Greying of hair, also known as greying, canities, or achromotrichia, is the progressive loss of pigmentation in the hair, eventually turning the hair grey or white which typically occurs naturally as people age.
Why you might have gray hair in your 20s: ⮕ What it probably is: Genetics As mentioned, melanin production will decrease as we age (among the other ~wonderful~ things that happen as we get older).
This overproduction causes depletion of the melanocyte stem cells which are required to produce melanin, the pigment responsible for hair color. [2] Premature greying of hair has been observed with greater frequency among certain families, suggesting a familial predisposition for the condition.
Another reason to protect your hair from the sun: Gray hairs are more fragile and lighter in color, making them more susceptible to sun damage than thick, dark hairs.
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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 as the eyes, skin, and hair.
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