Tretinoin
"I'm on my first week of using this. I don't have bad acne, I just wanted the blackheads on my nose to go away. The first week has been awful. My skin is so dry, red, burning, and now I have so many pimples. I never have pimples. My dermatologist said this would make my skin worse but I'm starting to wonder if this is worth it. My skin is disgusting. The other reviews say to keep using it and it will get better. I'll keep updating."