I used to always think dairy was the sole cause of my acne, and I certainly find that whey protein and dairy in general make me break out more when i'm blasting.
Having said that, most doctors agree that diet has little to do with acne, but its not fully understood;
http://health.howstuffworks.com/skin...-breakouts.htm
As a teenager I always had spot prone skin so I think its unfortunately a matter of genetic response to the hormones and your predisposition to bad skin.
Nizoral anti dandruff shampoo works for some -
http://www.acne.org/messageboard/top...hormonal-acne/
Unfortunately unless the conventional treatments work the best option seems to be Accutane, seen lots of people having success using a low dose whilst blasting. I use 20mg twice a week that is pretty effective and doesnt break the bank, it has its risks but at such a small dosage I think the dangers are massively reduced.
On a side note as well, Deca gave me horrible deep acne compared to test just giving me pimples, hence I now avoid Deca