By spotty things, you mean a red bumpy rash? Since you said there's no yellow, I'm assuming that's what you mean.
It's possible to catch an infection from just about anywhere. It could also be some sort of allergic reaction from a new chemical the pool or sauna may have used. If there is no heat, no discolouration beyond the red, then it's quite likely that it's not an infection, but some sort of irritant. Try putting some cortisone cream, like Cortizone 10 on it. If it clears up, it's NOT an infection. If it doesn't, it is.
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?the end of our exploring, will be to arrive where we started, and know the place for the first time. - T.S. Eliot