What to do if I heard it's good if you drink lots of water for acne, why?

Myth. This is the prescientific idea that you will "wash toxins out of your body" by your kidneys or through the back door. Being a kid with acne is difficult without having to put up with advice from ignorant people. Get a scientific rx -- your physician can clear you if you and those around you can get over the "natural is better" or "acne is your fault" mentality.