One April about 10 years ago, a friend and I went to Cancun for a girls getaway. We both swam in the ocean alot. She came home with a horrible rash and I didn't at all. It was right where her suit was. They called in Sea Lice too. Pretty nasty. Only solution, don't wear suits!! Swim naked
http://abcnews.go.com/Technology/story?id=98540&page=1