It’s the first day of your beach vacation and you stayed out in the sun a little (or a lot) too long. A sunburn is your skin cells’ reaction to damage from the sun’s ultraviolet radiation. In a first-degree sunburn, the top layer of skin, called the epidermis, is injured, resulting in redness, pain and swelling. Second-degree sunburns are more severe because the next layer of skin, called the dermis, is also harmed. On darker skin, sunburns are harder to notice at first because redness is less apparent.

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Persons: ”, Adewole Adamson Organizations: University of Texas, Austin Dell Medical School