I have a young guinea pig that might have a fungus. When I got both of my guinea pigs they were suffering from pneumonia and are currently on their last day of treatment for that. However, now I'm worried that Jimin may have a fungus. Maybe I'm just being over protective though. Anyway, there is a spot on his back that is completely bald. When I first got him it was actually a scab and since there were a few on other parts of his body I assumed it was just from fighting his cage mates at the store. Now I'm not so sure. The spot is completely bald. It doesn't seem scaly but there were like 2 tiny flakes of dandruff on it. He doesn't seem to be itching it, though it's not exactly an easy spot to itch I'm sure. Basically I'm wondering if I should be treating them for a fungal infection or if it's probably just scarring from a fight?