acne
"I'm 17 years old and have been battling awful cystic acne for about 10 years. As I've aged, it's only worsened, which I'm assuming is due to an influx in hormones. At first, doctors misdiagnosed me as having eczema. When I was finally diagnosed with cystic acne, my doctor prescribed tetracycline. I was on it for about 1 year, at age 14-15, and it helped a little, but not drastic changes. I noticed that it started turning my teeth brown, as if I'd eaten chocolate and didn't drink anything or brush my teeth afterwards. I was prescribed minocycline (Minocin) instead. It has helped my acne tremendously, but it is still turning my teeth brown, which is not flattering nor attractive, especially for a girl my age with dating and all."