About 3 days ago, after returning from a trip out of town, I noticed my beloved cat, Powder has these 2-3 inch areas around his limbs where his skin is showing through his fur. Powder is 3, he lives with 2 other cats (none of which go outside--ever.) In fact, he hasn't been outside except for going to and from the vets sice he was a kitten. He is slightly overweight @ ~16 lbs, but he is big-boned. He hasn't exhibited any symptoms of illness except for his ear mites in almost 2 years. the other 2 cats are also healthy. He seems fine, maybe a little less energetic, but mostly fine except for this strange condition. There are no fleas in the house either. Does anyone know what this might be? I am taking him to the vet tomorrow, but the worrying is driving me crazy.