Adapalene
"I have combination/acne prone skin but have only ever had a mild problem until I bought a 'natural" ebay kit that changed everything. It completely ruined my skin with a huge flare up and immediate dark marks. After that experience I bought tons of other acne products to combat this problem to no avail. My mom works at walmart and told me about differin gel so she brought it home in the morning. I washed my face with my zinc soap prescribed by my derm and dabbed a small amount of gel on my right cheek. In the morning I was beyond surprised to discover a painful cluster of RED acne on that spot so I stopped using this (I'm a light-skinned black girl btw)"