It really helps if you ask a complete question or at least give some context for what you want to know. This question is incomplete.
Answer See a doctor immediatly!!
red, blotchy, itchy, swollen.
I think it might be conciderd Exema.
You have red speckles all over about one hour after you go to the pool and it kind of goes away.
It's a rash.
Any time you get an itchy red rash on your stomach out of the clear blue, that's a pretty good reason to see a doctor. If not then, when?
Well their is herpes. There can be a red rash in the area of your crouch. It well be red and itchy. You can also get pimples and lumps their as well.
heat rash
probably a heat rash
The rash starts out as flat, red patches, but eventually develops some bumps. The rash may be somewhat itchy.
From case of ellergic
scabies