I'VE GOT THE SOLUTION TO THE MASTURBATION-ACNE PROBLEM THAT YOU SHOULD CONSIDER:
And this is it: After you masturbate/have sex, the semen that is ejaculated sometimes does not come out completely from the penis. So what needs to be done is that you should grab a tissue paper and squeeze the penis until ALL of the semen is out from the penis. If you do this , you wont get any pimples. My theory why this works is that, the unejaculated semen causes some hormone imbalance or something like that while leads to pimples. If it is squeezed out, you wont get any pimples. In addition, makes sure to drink 3-4 glasses of water immediately afterwards. While the reason this method works isn't fully explained scientifically, IT HAS EMPIRICAL PROOF. It seems to work, so why not give it a go?
Try this out and see if this works for you, it is definitely promising.