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A. The sun produces invisible rays called ultraviolet-A (UVA) or ultraviolet-B (UVB) that can damage the skin. Too much sun can cause sunburn, skin texture changes, and skin cancers. Rashes also can be attributed to sunlight. Even on cloudy days, UV radiation reaches the earth and can cause skin damage.
1 Mild cases of sunburn lead to redness of the skin and pain. 2  A few hours after sun exposure, the skin may become irritated. The main effects of sunburn usually occur 12 to 24 hours after sun exposure.  Severe cases of sunburn are also described as sun poisoning.