"i was on yas a few years ago and i stopped. i had no problems with it and it did clear up my acne, which was mild anyway. when i started it up again, there are two things i don&#039;t like about it: 1. normally my periods are very heavy on day two and taper off at a five, they also pushed back every month by about a week. with yaz, my periods are much lighter to the point where i&#039;m only spotting but then i&#039;m spotting for almost a week and a half and even though i&#039;m on the blanks, my period does not start now until almost the second week of my new pack. 2. my breasts are extremely tender all.month.long! at first, i didn&#039;t mind because my breasts grew by almost a full cup. i can hardly hug people! i don&#039;t know if i&#039;ll continue or at least take a break."