$121.84 later, here we go:
From the picture of the spot taken 1 week ago, the vet thought it looked like fungus, so he prescribed my cham some antifugnal cream and we'll see in 3 weeks.
The polysporin that was put on the spot also made it difficult for him to determine what it was more closely, so I'm just letting anyone know this for future reference.
I have to credit my cham with being extremely well behaved today
Thanks.