I had the same chronic acne problem as you. It's caused by sluggish overloaded liver function. I videoed myself explaining my internal cleansing process that i did. Its been 6 years since I've been cured. More recently I've also been doing coffee enemas to clean my liver and i love them. Here is my video. There is part 1 and 2.
http://www.youtube.com/watch?v=a2J9w9aq_TQ