Wow, you guys know NOTHING about acne. I'm going to state a couple of things I’ve come to understand about acne and exercise/diet.
1.) Acne and diet are linked in 90% of the cases
Look online, new research also supports this claim, debunking the previous "myth that acne and diet are unrelated"
2.) Sweating is good for acne
Not only does it increase blood flow to the skin it also helps the body clean out the toxins. Furthermore, it works all internal organs so it strengthens the immune system etc etc etc. It DOESN'T cause acne because sweat is largely composed of salt, which actually destroys bacteria (note, i'm not saying don't wash sweat off, but just know there's really no harm that can come of sweating)
3.) Weightlifting CAN cause acne in some people
Acne is the result of unbalanced hormones, that much is true. However, it is not directly because of high levels of testosterone that weightlifting causes acne. It is because you induce a great deal of stress on the body by lifting weights, this in turn causes a surge of pretty much every hormone which can lead to outbreaks in some people.
Moral of the story. I'm willing to guess that your diet plan is more likely causing your acne rather than lifting weights on its own. The acne diet connection is based on refined carbs, stop eating them, and you'll stop getting acne. This means no pop, sugar, candy, bread, pasta, rice etc etc etc
Eat Meat, Fish, Seafood, Fruits (the low GI ones), Nuts, Veggies
This is probably a better way to get your calories anyways, plus it is Amazingly Healthy
I had bad facial acne for about a year till I switched my diet, now I have perfect skin