Since when does your diet not cause acne? I was blessed with an acne free life but my brother had terrible acne and he was able to help a lot of it by not eating specific foods that caused acne for him. He wasn't eating like shit food or anything, I forget what some of the foods were at this point but one of them might have been chocolate. Try cutting out certain things out of your diet and seeing how they affect your acne. Or just get acne cream or whatever works these days.