Yes i think massage helps, but its not required. You see, vital components are not eliminated when you drink urine, but processed. Also some of them may not enter the body only thru skin. But in you case with Acne i think, it will help a lot. Also do a liver flush. Many times skin problems are associated with liver/ Gallstones and this may also manifest as mental blocks or bad feelings. It works both ways, your body is reacting to your feelings and stress but also your mind is reacting to the state of your body. I am sure you will see a lot of improvement by doing Master Cleanse program and by fasting/massaging.
There is one other thing which seems a bot illogical, but maybe i am complicating too much. When fasting you eliminate many toxins thru skin, so body pushes them out. With massage you push something like urine or oils in. So maybe massage blocks elimination of toxins. Anyone has any experience with this?