Cat bite abscess

A cat bite abscess is a collection of pus that builds up under the skin after a bite. A cat's teeth leave a small, deep puncture that seals over quickly and traps bacteria from the mouth beneath the skin. Within a few days an infection forms. Abscesses are most common in cats that go outdoors and fight over territory, especially unneutered males, and they often appear on the tail base, legs, face or back.

Signs include a swelling that is hot and painful, fever, hiding, loss of appetite, limping and tiredness. Sometimes the first thing an owner sees is a wet patch of fur or a burst abscess leaking pus with a bad smell. Cats can become very ill if the infection spreads, so do not wait.

Take the cat to a vet. Do not squeeze or lance the swelling at home. The vet will examine the cat, usually clip the fur and drain and flush the abscess, sometimes under sedation, and prescribe antibiotics and pain relief. A drain may be left in place for a few days. Bite wounds can also spread viruses, so ask about testing for feline immunodeficiency virus and feline leukemia virus, and about rabies vaccination status. Neutering and keeping a cat indoors lower the chance of fights.