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Why is my cat sick after returning home with a lump on its side?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 25 lbs

My cat ran away for a few days and came back yesterday. He has a hard lump on his side that’s very small but he doesn’t seem himself. He sleeps all day and doesn’t really eat as much food.

1 Answer

Most Helpful Answer

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Answered By Linda G, MS, DVM

Veterinarian

Published on October 29th, 2019

Hello. It is possible that Trico has a developing abscess, probably from getting into a fight with another cat. He may require antibiotics so it would be best to have him evaluated by your veterinarian as soon as possible. Hopefully, he will feel better soon. Thanks for using Petco Pet Education Center, formerly Petcoach.

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