Hi, so I got my guinea pig, Jason about two months ago. He had mites when we got him so we took him to the vet and he was treated. I was petting him today and noticed he has black dots clustered on his skin on the bald spot behind his ear. It's not bugs, the dots are on the skin it's not bumpy or anything just dots on the skin. He doesn't appear to be itchy or in pain even when the area is touched. Just wondering what's going on, we don't have the money to take him to the vet unless it is absolutely needed. Thank you so much!