My russian tort has skin peeling from under his chin. It looks like a white bare patch now with the skin off. Is it normal for russians to shed skin? Several months back a little skin was peeling off a back leg and after awhile it looked normal again. I just added some coconut fiber to the coconut bark so it wouldn't be so dry and dusty, and then the chin peeling happened. Should I be concern? I've had him for a year now.