It’s been said that cell phones carry 10 times more bacteria than a public toilet seat. (Just let that sink in for a minute.) And whenever we put our phones up to our ears for a call, a lot of that bacteria ― along with sweat, oils and possibly makeup residue ― comes into contact with your skin, and could potentially lead to breakouts. And the blue light emitting from our screens is rumored to prematurely age our skin, too.

Dr. Estee Williams, a board-certified medical, cosmetic and surgical dermatologist based in New York, told HuffPost that while the bacteria on its own won’t necessarily cause acne, all the other grime hanging out on your cell phone could harm your skin.