I sometimes tayna azoi:
I think the gemara says somewhere (you tell me where) that we only have to listen to doctors about external illnesses, but that they don’t know anything about internal illnesses.
I contrast that to today, where we generally do think they know what they are talking about–except about dermatology. Everyone is modeh in dermatology they are totally clueless and cannot diagnose or understand or heal anything. So it is the opposite!!
The teretz is that we only know they can’t fix skin conditions because we can see that it isn’t fixed. If we could see inside, we’d know that inside they are even worse!