Benzoyl peroxide / clindamycin
"Also for the people saying it dries our your skin very badly, you must be using too much. It does dry your skin out but not badly at all. You're supposed to use very, very little bit of it on your acne. Not your whole face, just your acne. I learned the hard way. I loaded it up on my chin & it made my chin so dry & itchy & red. It looked horrible, like my whole chin was scabbed. It went away after I stopped putting the cream on it for a day or two."