acne
"Well if you use it properly, you should be ok

I'm just an example of improper use and severe side effects 

I was a stupid 18/19 year old who mentally freaked out,  used way too much. I've had severely burnt skin & redness the last 17 years now. Quite the cross to carry. Wish I never came across it (only had minor acne anyways) but to the medicine's credit, I did misuse it"