Yeah, huge diff. Uncle told me and he's a doc. You can tell by your piss, if it's yellow you need more water, if it's whitish you're good. The more drink the more you piss the better haha.

Also eat veggies and watch your diet. Just wash your face when it's oily then when you can feel it smooth it's all good. Then get 8 hours of sleep. Stress can equal acne too.

Worst case scenario, go see a dermatologist. Peroxide Benzene (sp) + the anti-bacterial/infection pills should solve the acne 95% of the population gets.