I've had cystic acne before it was from deca , it's the only aas that gives me bad acne some never use it. I had to take accutane 40mg a day to clear it but I've been good ever since.
I'd also suggest a quality fish oil, staying on an aI, 100% tea tree oil apply it to affected areas and add to shower gel. Eat clean foods stay away from refine dsugars and processed stuff.