For me, I believe it is due to estrogen....why do I believe this?
Because I can use copious amounts of Test P, Masteron, Tren, and EQ and don't have acne. Yet let me take anything over 400 mg of Test E or C. and my back turns into a mine field. Not talking about the little bumps... The dime sized ones that squirt shit across the room if you pop them. I've never used an AI, if I use Test E or C again I probably will have too. Clomid also wrecks my back too.
I've tried it all....
Chopper's Body Wash
Zinc Shampoo
Niz Shampoo
Benzyl Peroxide cream
Salicylic Acid
Mega Dose B5 5g/ed and 10g/ed
Salt Scrubs
Exfoliating oils
Some others I can't remember but basically everything OTC, then....
Minocycline
Bactrim
Evoclin
Bactrim and Evoclin worked finally