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Hi there, you are through to Dr. Jake. Im a UK based vet. im sorry to hear of your concern with your cat, Oz. we see these episodes regularly in cats who get in fights. Often they initially lead to something thats painful from a bite or scratch showing as a limp. If the leg is now swollen this could be that an infection is now starting- these often take a few days to become evident and result in swellings or an abscesses over a bite or scratch wound -often these can be difficult to find initially as fur hides wounds well.
As the limp is worse , I would recommend seeing a vet today to provide additional pain relief on to what they have already provided and for a further examination of the limb to see if there is an abscess developed. they may try and remove the fluid from it is one is there, if the bite is close to a joint on the leg that may recommend keeping Oz in for fluids and monitoring as joint infections can make cats quite sick.
i hope all this information helps