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UVA, has a strong penetration, clouds and glass can stop it. It exists throughout the year. UVA damage to skin is light aging, injury dermis layer of collagen and elastic fibers, loss of skin elasticity.

UVB, the middle penetration, and the summer afternoon particularly strong. It is tan skin, grow splash, and skin sunburn, dry, hot red swelling, burning and peeling, and other phenomena.

UVC, it will cause skin cancer. But do not worry, usually it will be the ozone layer absorbed not at the surface of the Earth.

Therefore, we can see that ultraviolet light can make our skin dry, rough, black, a colour patches, and the aging of relaxation, produce wrinkles.

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