Ultraviolet penetration ability is strong, can reach the dermis, the skin tanned, very harmful to the skin, even in the non-summer period, although the intensity of ultraviolet light is weak, it still exists, but long time accumulation is easy to make skin injury, melanin precipitation, skin aging and relaxation problems
The intensity of ultraviolet rays is highest from April to September and lowest in winter
 So women who want to be beautiful must wear sunscreen every day