Here's something that lots don't know regarding acne on a cycle: Acne/oily skin comes from high estrogen in the body. So the reason acne occurs on cycle is because an imbalance between testosterone and estrogen due to aromatization, pretty much the same way it happens during puberty. Many docs don't even know this. I was lucky that I had an HRT doctor (bodybuilder friendly), who was very knowledgeable, educate me on this, and in the course of being on cycle, he prescribed me clomid at 50mg per week. The reason he did this is that normally, testosterone and estrogen are in a balance so when testosterone rises to high levels when on cycle, the hypothalamus sees the increase but there is low estrogen comparatively so aromatization starts to occur to balance out the equation. Clomid itself is a type of estrogen. We know that it also helps testosterone levels return to normal during PCT because the body sees the increase in "estrogen" and increases testosterone to balance. So on cycle with clomid, what happens is that the hypothalamus recognizes that you have "estrogen" in the body also at a higher level. This keeps the body from overly aromatizing the testosterone into more estrogen and creating the terrible acne problems. The higher the dosage of testosterone, you may need more clomid, either a higher dosage or more spaced out frequently during the week.
Before when I would go on cycle, even a small one at 300mg/week, I would get terrible acne on my chest, back, etc., and it wasn't until I found this doc and did as he said that I have been able to be on a full blown cycle and have clear skin.