On one of Nedicks' back legs, she has no fur on that little knobby bone where her leg bends--what I call her elbow. The skin doesn't look irritated--it appears to be a normal pink color--and there are no lumps or bumps, other than the bone. Is this normal? Do any of your cats have this? The only thing that makes me wonder about it is that she's only got it on the one leg, and all of Nathan's elbows are furry.