eli5 why you don’t get infections from your mouth, nose, or ears often? What’s the difference between those openings and if you had an open wound which could easily get infected

Question

eli5 why you don’t get infections from your mouth, nose, or ears often? What’s the difference between those openings and if you had an open wound which could easily get infected

In: 37

Answer 1

There’s “skin*” on the inside of your mouth, nose, and ears.

*Epithelium, which is a more general category than skin. But for ELI5 it’s pretty much skin.