What causes a lump or bump on my cat's back and what should I do?
Updated On September 23rd, 2025
Pet's info: Cat | American Shorthair | Male | 6 lbs
My cat has a lump or bump on his back
4 Answers
Most Helpful Answer
Published on June 16th, 2018
If Yellow Cat is allowed outside, this lump could be an abscess. Cats who go outdoors can get into fights with other cats, and bites from other cats frequently lead to abscesses. These are very painful to the cat, and need to be sterilely drained and flushed, and oral antibiotics prescribed to treat the infection. Other causes of the lump include a cyst, a benign tumor, or a malignant tumor. I would have him seen by a vet first thing in the morning to have this lump examined and diagnosed so it can be treated as needed. Best of luck.
20Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on March 12th, 2018
From your description this sounds like an abscess or pocket of infection. Outdoor cats get these from fighting. You can use a hot compress on the area and massage it. If you find a scab I would remove it so the infection can drain out. If you can take him to a veterinarian they will sedate him and clean the area and give him antibiotics. Once the area has drained you can keep the wounds cleaned with hydrogen peroxide. If you are going to keep him I recommend neutering him so he’s not so prone to fighting. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for your cat.
1Pet Parents found this answer helpful
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Published on April 24th, 2019
I wonder if this lump is potentially an abscess. I would recommend having a veterinarian examine Loki sooner rather than later since he is in pain. They might recommend a fine needle aspirate which is a procedure where a small needle is used to take a sample to examine microscopically.
5Pet Parents found this answer helpful
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Published on January 27th, 2018
If the growth is changing and growing it is worth having your vet check the area. They can take a needle sample of the mass and look at the cells to determine if it is a fatty tumor or something cellular that will need surgery. It is better to have it removed if it is small and caught early than wait until it is too large to address
1Pet Parents found this answer helpful
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