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Sunburn

Sunscreen and Sunburn FAQ
While some experts believe that frequent application during sun exposure is beneficial, some experiments have shown that a single application of sunscreen will suffice for the day.
The Effects of Ultraviolet Light
The skin has evolved to protect us from the harmful effects of ultraviolet light. Sunscreens were first developed to prevent sunburns by blocking UVB; they allowed us to prolong our time in the sun, but that resulted in increased exposure to UVA. Modern sunscreens attempt to block the whole spectrum of UV light, so are called broad spectrum. Not all so-called broad spectrum sunscreens protect skin from the whole range of UVA.