Benzoyl peroxide / clindamycin
"After suffering for almost 20 years with severe acne and cystic acne. 
I have been on Duac for only 3 weeks and have seen the biggest change than with any other treatment I've tried.
Almost all acne has gone, only cystic acne that will take longer due to being so far under the skin.
It's amazing, I've not felt my skin this smooth since I was 9 years old. 
No new acne breakouts since being on this either. Which is amazing because I'd normally have one or two new ones every day..

LOVE this stuff"