Tretinoin
"At age 36, my acne started to come back after a stressful time. It was concentrated on my chin, and was relentless. New cysts every single day. My doctor prescribed Tretinoin cream plus an oral antibiotic (doxycycline). I was so nervous about starting because I read so much about it getting worse before it got better. But to my amazement, after just a few days I started to see drastic improvement. Not a single new pimple, the existing ones healed quickly, and scars are fading fast. I'm shocked (and extremely happy!) at how well this worked for me."