J.P.
Neosporin worked on the sores for us. Also, anything thick and greasy that would put a barrier between him and the poop, it gets so acidic when teething. Even something like Aquaphor, and TELL the daycare that they need to slather it on. If it is just pee, you may not even want to wipe, so that it isn't more irritated.
If you haven't started on probiotics, do, now! With the antibiotics, they are sooo important to stop the rash cycle, but good while teething too.