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HI this is DRB and I would be happy to help you with this. Unfortunately, you will have to take him to be seen. The smell you are smelling is because there is an abscess in the tissue. Cats have some very bad organisms in their mouths that can cause very serious illness if not treated early and promptly. Some animals and humans have even developed sepsis from cat bites. Take him in to a vet and at least have them give some antibiotics that will treat this so it does not get any worse.
I hope this helps you but if you have additional questions please let me know. Sincerely, DRB
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I check my computer every night so please let me know if you have additional questions. Sincerely, DRB
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