Why does your skin turn red and peel when you get a sunburn? In this episode of Gross Science, Anna Rothschild explains what’s going on in our skin when it burns from sun exposure. Follow this video up with The Science of Skin Color, How the Sun Sees You: Revealing human skin in ultraviolet light, and How do wounds heal & how do scars form? Save Video This feature is being tested. Saves will disappear if you clear cookies. Find saved videos here.