My cat has swollen chin (pics)?

Im sorry to hear about your cat, trust me know its nerve wracking, my cat had a VERY similar thing happen to it. Her chin got swollen and eventually started scabbing up. Our vet called it rodents disease, makes them look like a rodent. He said that it could very well come from plastic. We used to put her water in a plastic bowl. good luck, there was some medicine that made her all better, but it came back every once and awhile. mention rodents disease when you go in there.