Melasma is an acquired pigmentation disease that mainly involves the development of symmetrical yellow-brown facial patches. The incidence rate of the disease is increasing yearly. Therefore, actively studying the exposure factors that induce melasma could contribute to the prevention and treatment of this disease. In the present review, the possible exposure factors were summarized.
Keywords: dermal factors; exposure factors; genetic factors; melasma; microRNAs; oestrogen; oxygen free radical; ultraviolet.
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