Tretinoin
"Tretinoin increases cell turnover. For those who have an initial purge, where your acne is getting worse, stay patient!!!!! I know how hard it is to look into the mirror. It will get better. I use it every 3rd night and use cetaphil lotion after applying it. My skin is to sensitive to use it daily. I also take an antibiotic every day. It can take up to 12 weeks for a pimple to form; therefore it takes a few months to clear all the pimples up... Including the ones that haven't fully formed yet! Be patient!!!!!"