For those who asked about the rash...

It is appearing all over but is worse where the swimming suit touches the body. It's lots of small reddish bumps, packed densely together where the swimsuit sits, less dense on other areas like the stomach and back. The swimsuit is a two-piece.

I'm not sure what it's made of but will check and post. It's been washed with pretty standard washing detergent. I'll check and get more details.