Rash After Sex ?? 😕😐

So recently when my boyfriend and I have sex he gets a little rash, like a couple red spots on his penis and we don't know why. We've both been checked for stds and we're good. I had a yeast infection like 2 weeks ago and I got rid of it so why is this still happening? Also I thought it may be because lately I've been really dry down there so maybe the friction irritates it? But he says he doesn't feel the dryness. Please ladies any advice helps. We're both going to make doctor appointments but any insight helps