birth control
"This completely broke me out in fluid filled hives all over my heck, chest, shoulders, back, etc. I assume I am allergic to one of the hormones in it. As soon as I stopped taking it, the acne and hives went away. As for a time frame, I took it for 3 days when the acne started. Stopped after a month. Took another month for the acne to completely go away. This could just be me, because I tried the IUD next and was the 1% of women that it didn't work for - my body expelled it and wouldn't allow it to stay in place. However, I would not recommend this pill to a friend."