"i&#039;m 17 years old and have been battling awful cystic acne for about 10 years. as i&#039;ve aged, it&#039;s only worsened, which i&#039;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&#039;d eaten chocolate and didn&#039;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."