2) According to the shortwave ultraviolet to have obvious disinfection effect to bacteria and the action principle of uvb rays promote the synthesis of vitamin D,this shows that the action level of both ultraviolet (uv) are involved in biological cells structure change, and the action principle of uva rays promote skin pigmentation is to strengthen the function of melanin cells rather than changes in cellular structure. So I agree with ultraviolet ray mainly related to the skin cancer being medium short wave ultraviolet light. So as long as there is effect to the skin pigmentation I will try to choose far away from the medium short wave ultraviolet ray, a longer wavelength uv. At least I think that is logic. After all vitiligo don't kill people. So treatment of vitiligo must avoid causing more severe illness than vitiligo, otherwise unforgivable.
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