If you’ve ever had a particularly bad breakout, you’ll most likely be familiar with benzoyl peroxide. This anti-acne hero tops our charts as it directly inhibits the growth of acne-causing bacteria. It is particularly helpful for red, inflamed bumps, and paired with retinol, is great for treating and preventing acne scarring as well. Pro tip: Benzoyl peroxide is very drying, so avoid using it all over your face or if you have dry skin.