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My cat's ear has a bump, pus, black stuff after fight. What is it?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | unneutered

Good evening. My name is Keira and my cats name is Jaguar. For some time I noticed him twitching his ear a lot, but recently he's gotten into a fight with my other cat and his ear was bleeding. I tried to help clean the blood but he wouldn't let me get near it. Afterwards I noticed a small to medium sized bump in his ear with some puss around it. Now the puss has cleared a little but the bump is still there and now there is some black stuff a top of it. He isn't acting much different than usual.

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1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on October 1st, 2017

Hi Keira! I'm sorry that Jaguar has a bump on his ear. When cats get into fights with each other, it often results in infected wounds. Cats have a lot of nasty bacteria in their mouths, which is why their bites cause infection. Given that there is pus coming from the bump, it does sound infected and he should see a vet for it. The vet can clean the bump and give him antibiotics to treat the infection. On a side note, I see that Jaguar isn't neutered. Neutering him will help cut down on the aggression between your cats, as that is typically hormonally driven for territory and mating with females. I recommend having that done as well. I hope this helps!

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