Take accutane. 20mg twice a week will prevent all acne from cropping up. At that dose, you will experience no side effects. It's a stupidly low dose.
If you want to get rid of all acne, take 40mg ED for 2-3 months and your skin will be clear. Good luck.
EDIT: I should note that this just masks the issue. Megatron is right in saying high estrogen or estrogen fluctuations in general will cause acne in most people.