I have an 18yr old son. Because of his personal belief system he does not spank the monkey at all. He still has acne. The other posters are correct, the urge to spank the monkey and the Acne are both caused by high testosterone, nothing you can do about that but wait it out. Excessive playing with yourself, spanking the monkey will not make the Acne worse.
Try eliminating milk and dairy, it's very bad for acne. See the link below.
Liver Flushing is quite easy once you do it you'll wonder why you were so afraid! It may help because the liver processes hormones.