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My cat has a squishy, liquid lump on its side. Should I worry?

Updated on September 23rd, 2025

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

My friends cat has a large lump on its right side sort of behind its right leg. It feels squishy and it doesn't hurt the cat because I have felt it. It also feels like it's half liquid, half some kind of mass. Just wondering if it's something we should be worried about?

1 Answer

Most Helpful Answer

Laura Johnson VMD

Answered By Laura Johnson VMD

Veterinarian

Published on July 21st, 2017

HI, thanks for using Petco Pet Education Center, formerly Petcoach!

I wonder if Shadow is an outside cat. If he is and the swelling had a sudden onset it could be an abscess from fighting with another cat or animal. The fact you describe it as possibly liquidy could indicate puss.

If her cat is older and indoors it could be a cystic mass.

I would recommend that she have a Vet take a look at it today before the weekend in case it is an abscess before it possibly breaks open. If it is an abscess the Vet may open it for it to drain and provide antibiotics

Good luck!.
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