I had a doctor mis-diagnose a very serious eye infection that could have led to blindness on one side as... a stye. And recommend I treat it with hot compresses.

Luckily I'm obstinate and finally saw a specialist who correctly identified it and treated it, but it's critically important to be very active in your own medical treatment. Get second (and third, and fourth..) opinions, raise lots of questions, push back (politely) against things that don't seem to make sense.