A little bit of sun goes a long way. Sunlight contains invisible ultraviolet (UV) rays that can damage your skin, causing it to burn or wrinkle, and even lead to skin cancers. A colored chemical material in our skin called melanin absorbs UV rays to minimize the damage. Fair-skinned people (whose ancestors come from less sunny places) have less melanin, so they’re more susceptible to sunburn and forming harmless spots of melanin known as freckles. People with darker skin (whose ancestors come from sunny places) produce more melanin to combat UV damage. But even high levels of melanin aren’t enough to protect skin from wrinkles caused by overexposure to the sun.
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