Mites Nips in Ear with dry skin

Hello all, I recently adopted a new guinea pig for the first time. Her name is Athene and she has been with me for almost a month. I have owned several exotic pets in the past such as different types of parrots, rabbits, and a few other small rodents but this is my first time owning a piggy. I was looking through the threads and I haven't quite found one that answers my question. When I first got Athene, she had a few nips in her ear. All but one of them seemed to be healed over and old. The one that seemed newer wasn't necessarily bloody or red but seemed to have a little bit of a scar. It is just a tiny hole in her ear. It seemed to be perfectly fine and doing well but recently I have noticed a patch of dry skin forming over it. I have a vet appointment scheduled for her on Thursday, but I was worried about mites and wanted to know if anyone thought this might be a mite problem or just the scar peeling off? She has no other symptoms of mites that I can tell and she was seen by a vet and got a good checkup about two weeks ago. Thanks for your help in advance!