Thanks to sunless tanners, there are so many ways to get a tan without being exposed to harmful UV rays from the sun. But are all these self-tanning options safe? In this video, dermatologist Dr. Michelle Henry breaks down everything you need to know about self-tanner and explains how its active ingredient, dihydroxyacetone (or DHA), works when applied to the skin. Plus, she shares what to look out for with aerosol options and spray tans.