I’ve had my guinea pig fry since July last year. Today I was feeling his ears while playing with him and felt a scab like feeling. When I checked it was white crust on the inside of his ear more towards the outer inside of his ear. I don’t know if you can tell but it also appears to have like a tiny little hole where the scab is. What can this be ? Do I need to take him to the vet as soon as possible ??!