Pool Rash

Great advice Erin.
A couple of things I would add. It's not because your daughter is ok with this pool that you son is, we all have different sensibilities to chemicals. Check sunscreen, add salt (sea salt) in his water (the salt helps the elimination of chlorine in the body -- use good quality salt), good shower afterwords (use organic soap). If that doesn't help I woudl recommend to check if some chemicals are stock in his kidney, that can create rashes on the skin. Good luck!

My sisters son got this, but we think it was from the sunscreen.
Also, every pool is different, as far as chlorine treatment goes, so make sure he washes really well right after swimming and that you moisturize with an aloe based lotion. It took a week or so for my nephews to clear up, but it was really funky at first. We didn't know if he got a sunburn or if it was a rash, but now we know that for some reason, the sunblock we have always used is no longer compatible with his skin.
Good luck
-E.

It could be a staff infection.

I have to wash the chlorine off really well and then moisturize or I get an itchy red rash...
YMMV
BLC