Solar radiation includes, of course, visible light. UV radiation at high doses increases the risk of basal cell carcinoma and malignant melanoma . Mild sunburn is a first-degree radiation burn. In a mild sunburn, the skin is red and painful. The outer layers of the epidermis peel in 3-6 days, with itching and redness persisting up to a week or more.
Extreme sunburn can also be a second-degree burn.
Third-degree sunburn is rare, and likely requires several days of exposure.