Adapalene
"Follow the instructions and heed the words of the people who have used it before, and I feel like there's no reason Differin won't work for you. I've had problems with adult/hormonal acne for awhile now, and this is the first and only thing that has made a seriously noticeable improvement. My skin did do the "purge" before it got better, but I just gave it some time like the instructions and other users said, and in about 3-4 weeks I noticed serious improvements in my skin. It looks MUCH better than it has in years. If you're not a patient person and will give up when the purge happens, then don't waste your money."