Accutane
"I was on Accutane when I was 16 for about 8 months. I first took 40 mg a day then he moved it to 80. The only negative side effect I had was dry lips. My doctor kept me on it longer because I have extremely sensitive skin and can't use topical things like benzoyl peroxide because it makes my break out in skin rashes.  I have had clear skin up until about six months ago. I am 24 so that's 7 yrs of clear skin. I am going back to my dermatologist this week so hopefully he will put me back on it because it is amazing. I would seriously stay on it forever if I could."