I'm fostering a 5 year old rat terrier and he has a flaky bald patch.
This is an isolated patch; his skin and coat are otherwise healthy: no dandruff, fleas, mites, etc. He doesn't seem to notice it, he doesn't lick or chew it so it's not caused by him irritating the area. It's not inflamed or infected, it just constantly flakes skin.
Since it's not causing him any distress, I'm mostly asking this question so that I can find a way to stop the skin flaking before we take him to adoption events. I also want to make sure it's not a sign of something more serious.
Edit: He was tested at the vet and it's not mange. He's since been moved to a foster in a different region that has more people interested in adopting, so I won't be able to follow up anymore unfortunately.