How It Works: Sunburn The science of sun damage.
UV radiation damages your DNA, setting you up for possible skin cancer and suppressing immunity. But your skin does try to fight back. As soon as you're exposed to UV radiation, cells called melanocytes release melanin pigment that blocks UV rays-in the form of a tan that can reflect UV light. You've heard it before, but it bears repeating: To prevent burns, use a sunscreen that blocks both UVA and UVB rays, and reapply often.
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