Is it possible, that I get pimples, if I bath in water that is high in Calcium?

Nope it's actually good for your skin :-D ( milk baths are amazing for skin and will give you a great glow and soft skin )

- - - it's only bad if you are allergic to milk

Nope. Calcium has NOTHING to Do with pimples... Only too much Stress, too many Hormones, or having the bad luck to be a Teenager- does. If you have ANY of These, -they're your Problem ! :)