Last night I came home from being away at school and noticed that my cat Goofy had developed a small spot on her back leg that was furless. I picked her up and it looked like a callous. It didn't bother her when my boyfriend and I touched it, and my mother who had been taking care of her said she was acting fine. She is a bit strange, and sits in odd positions, and also likes to sleep atop the cable box on the television set. Should I take her to the vet or should I see if it starts to bother her?