I basically know what causes my acne, yet I continually fall off the train. My skin always gets better once I stick to what I know works for me. I am clear for months. Then I tell myself that I can slip up, and slip up some more. Next thing you know I am faced with a huge breakout.
It's especially bad because my acne is very much diet related. So I always breakout around the holidays and in the Winter when I get depressed and want to eat comfort food. I am having a lot of trouble sticking to a low-GI diet.