Grow melasma with the human body on the skin pigmentation. It is due to an increase in melanoma in vivo, and accumulate in the skin caused by the basal cells, the melanin from tyrosine, in the tyrosinase-catalyzed oxidation and polymerization formed. That the number of melanoma, density and distribution, not only between different ethnic, each person different, but also in different parts of the same person are not the same. Generally speaking, people face, the back, head and neck, armpit, nipple more black, and some of these sites are more melanin.
Pigment metabolism and endocrine great body, such as adrenal insufficiency who are more black skin; some patients with hepatitis, facial looks gloomy or chloasma; some young woman due to ovarian dysfunction, irregular menstruation, etc. will also appear facial pigmentation.
Sun exposure and ultraviolet radiation can also activate the tyrosinase, to accelerate the formation of melanin, it was particularly prevalent in the skin less freckles, light yellow hair, the sun-sensitive people.
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