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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 They can damage skin cellsâ DNA directly, and are the main rays that cause sunburns. 2  They are also thought to cause most skin cancers. 3  UVC rays have more energy than the other types of UV rays, but they donât get through our atmosphere and are not in sunlight. 4  They are not normally a cause of skin cancer.