Uh...

Besides the one in the infirmary? Hell if I know.

[ He isn't going to say again that he studied first aid, because he doesn't want to volunteer for anything.

Sans's lack of helpfulness stems from not really wanting to bother digging up who wants their skill as a medic or their ability to use healing magic outed publicly. There's more healers, but Sans hasn't really gone around taking a tally... but he knows someone who has: ]

You better ask Zuko, she's gotta better idea of who can do what around here.