Hello, I have two new guinea pigs (females), they are three months old and I got them at the store last week. I have them on fleece. They are both happy and are popcorning, eating and normally. I don't know when this started, but they are scratching and biting themselves quite a lot on sides. I tried to check them and I think I saw a little dried skin and one has a little dandruf. Is it because of the new bedding? Do you think I should use coconut oil and rub it to their skin or could it be mites? It would be great if you could advise me because the vets are expensive and I have two of them. This is the first time they are using fleece and the humidity is somewhere between 60% in the room so it's normal. I also change the bedding every few days. Is there any way I could try to do something or is the vet necessary?