Clindamycin
"I'm a 31 year old mom of three, and had been experiencing the worst acne of my life for the past year. I've always had acne off and on since a teen, but the past year I had cystic acne along my chin line and under my jaw like nothing else. Painful. Embarrassing. My Doc prescribed this, in the liquid form that you pat on. I use it nightly every or every other night (along with a RX benzoyl peroxide cleanser first). One month down and acne cleared up almost immediately. I will continue using for maintenance of course. I'm sensitive to Retin A, this stuff though never leaves my skin dry or burned like Retin A did."