Hi there. When my hedgie had mites, she also had swollen looking sores. First she had one of her foot and then she developed more and more. The only way you can tell for sure what it is, you're really going to need to see a vet. Like Kalandra said, it doesn't NEED to be an exotic vet. it would be better if it was but you just need someone that cares enough to learn about treatment and help u. If it is mites the vet needs to treat you're hedgie with revolution at a small dose. That cleared up my hedgies mites quickly. You should also bring a fecal sample so the vet can look for parasites.