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What's this bump on my outdoor cat's head? Could it be an abscess?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | unneutered | 5 lbs

Why does my outside cat have a big bump on the side of his head? Did something bite him ?

3 Answers

Most Helpful Answer

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Answered By Dr. Dayna, DVM, CVA

Veterinarian, Certified Veterinary Acupuncturist

Published on October 18th, 2017

Cats who go outdoors tend to get into fights. Bite wounds often cause abscesses. I suspected the bump is likely an abscess. We typically lance and drain them and then put them on antibiotics. An appointment with your veterinarian tomorrow would be a good idea. Good luck and thank you for using Pet Coach.

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Other Answers

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    Answered By Jessica Keay, DVM

    Veterinarian

    Published on

    I am sorry to hear about Reggie. A photo of the area may help us identify a cause. I worry in outside cats especially about an abscess (or pocket of infection) as a result of a bite wound or other injury. We can see swellings on the face as a result of tooth root infections as well. In older cats we can also have tumors arise on the face. An examination by a veterinarian would be recommended to determine the cause and appropriate treatment for your kitty.

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    Answered By Andrea M. Brodie, DVM

    Veterinarian

    Published on June 26th, 2018

    This is a very sweet looking cat. There may be a swelling on the right side of the head which could be caused by a cat bite abscess or other wound. I suggest you take Simba to a veterinarian for an exam. If it is an abscess, Simba will need antibiotics to curb the infection.

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