There is a very strong theory that water retention (also called edema) causes acne, there have been studies of facial edema and acne vulgaris being strongly linked. http://scholar.googl...dt=0,5&as_vis=1
You can read more about it here www.freeacnebook.com It's just a diet so you don't have to buy anything because there is nothing to buy.
In a nutshell
Protein that has been cooked causes damaged protein which is absorbed into the blood and ends up in the skin. Damaged Protein is water soluble and causes water retention in the skin. When the skin is full of water the pores get blocked and trap sebum canals, the result is a slow release and buildup of sebum hardening and causing skin inflammations. Sebum canals production rates are different in other people so that's why some people don't get acne and some do, but mostly all have water retention.