Tretinoin
"If you've come here looking for some hope on whether Retin A works or not than your answer is yes! I have been struggling with acne for almost 3 years now I want to think its a phase but who knows. I started retin A Febuary 2015 and it is now May 2015 and my skin looks AMAZING. Trust me I had that "purging" phase and it sucked so bad I didn't even want to go out and public because of how bad my face was. If you feel like it isn't working give it TIME, time and patient is key when using this product. I went through two purging phases during week 3 and 5 but after that it was pretty much a smooth ride. STICK WITH IT! Give it 3-4 months!"