"i was on yaz for 6 months. i went from having severe back acne and moderate face acne to........almost no acne!! for the first time in my teen years (im 17), i am not embarrased about my face, and i can wear a bathing suite without being embarrassed about severe back acne. i have a relatively light period that lasts for 7 days, but only 3 or 4 of those days are real flow. i can predict my coming period down to the hour. the only bad thing is that i gained 10 pounds and i can&#039;t get it off. some people lose weight on this birth control, and some gain. it&#039;s hard to tell how you will react. try the pill and see if it works for you. i am taking a break to see if the weight comes off."