Bald Spot on Hind Paw

Hi everyone!

I noticed a small bald spot on the inside of my toller's hind paw today. He does occasionally bite his leg in the morning when he leaves his crate as a part of his morming ritual but he doesn't do it obsessively or aggressively.

It doesn't look red or inflamed so I'm not sure exactly what it could be. I intend to take him to the vet but I have to wait till Monday to do that.