Is it dangerous to your health if you break out in red splotches and feel very sick after you shower?

Yes

Explanation:

You might be alergic to water, other wise known as Aquagenic urticaria. It is not that common, but before taking any further actions, you should tell your parents and visit the doctor. It is very rare and any water including purified or tap may be like viruses to your skin.

answer; genes dictate the production of specific enzymes, and affected individuals have genetic defects that cause them to lack certain enzymes;

if u need the answers look it up on google youll find it trust im just saying this incase no one out : )