Sometimes after swimming in our local pool, the skin on my face is red and swollen and very hot.
It's almost like a sunburn, but it only appears several hours after swimming, and regardless of whether there was sunshine or not. (it's a lot worse if it was sunny though)

can this be a reaction to chlorine?
I've had red rashes on my shoulders/back sometimes after swimming in the indoor pool where all the kiddies swim, but those usually appear minutes after being in that pool and disappear rather quickly.

The sunburn-like one persists for days, is very painful, and I usually run a temperature to boot.
I just don't know what it could be, because as mentioned, it only occurs many hours after leaving the pool.