acne
"I had fairly mild acne, but when I went to the doctors it had been flaring up, and looked quite bacterial. When I first started using it I was happy, as it appeared to clear up my spots in less than a week, but after maybe the third use (I was using it once per night) I noticed my skin was very dry, but was not too worried as this is a known side effect. Unfortunately, the dryness only got worse, even when I used it after moisturiser, and even stopped using it. It got to the point where my skin was so dry and irritated that it was bright red, and I could barely splash water in my face without it stinging. If I used cleanser my face would sting so badly I cried. It took 3 weeks to clear up, and I was left with chemically burnt skin."