Ok so today I brought my guinea pig to the vet. He had been scratching a lot and I was worried it might have been mites and when I brought him to the vet, the vet said it wasn't after checking. The vet did say that the scratching was because of something else, but he didn't gave me the name of it and that's what I would like to know. Ok so apart from the scratching, on the edge of my guinea pig ears is somewhat rough and I guess crusty, he has a small bald spot on the back of both of his ears, and he also had like a slight crust like on the ears on his nipples. What the vet said it was, was something concerning oil that became rough. The vet was also able to actually take out the crust (I guess you can call it like that) from the nipples and part of my guinea pigs ears and said I just needed to slowly take it out with baby oil. He said that the balding was because it and that it wasn't fungi. I dont know if that was of any help, but I hope it was and that maybe somebody can give me the name of what my guinea pig has.