Genetic reasons. Autosomal genetic is the main cause melasma. More from the 5-year-old children, mostly women, heavy spring and summer, autumn and winter light. Light brown to tawny and the size of needle to rice spots, symmetrical distribution in the face (especially the nose).
Ultraviolet radiation. The ultraviolet radiation in sunlight, prevention is the major reason for this is the summer sun need the reason.
Endocrine reasons. Endocrine disorders is one reason of women have melasma, menstruation and pregnancy of the change in hormone levels, can influence the formation of melanin.
Lifestyle issues. Stress, the partial eclipse, insufficient sleep, and other bad living habits will also increase the melanin. Therefore, the instability of sleep time, the skin of the metabolic rate also poor, it will affect the formation of melanin granules.
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