For the past couple of days I've noticed that on Gussy's chin their is a small patch of fur missing. I'm very worried. He's been acting normal. I pretty sure he hasn't been scratching a lot of of the ordinary. I just really hope it's nothing to worry about. I wonder if he just scuffed it off or rubbed it off etc. Him and Aflie are not in the same cage so it couldn't have been from a wrestle. Please respond and thank you in advance.