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Cat has a burst side growth, feverish & not eating. What's next?

Updated on September 23rd, 2025

Pet's info: Cat | Siamese | Female | spayed | 8 years and 7 months old

Luna is an 8 year old siamese who's had a big growth on her side for months. A vet felt it and said it was a cancerous tumor and that there was nothing to be done. Recently it burst and a clear liquid came out and kept coming out for two days and the mass decreased to half its size. On the third day, she wasn't feeling well, she was feverish,she wouldnt eat and there was a white substance coming out of the mass. I think it might be a sebaceous cyst. What do you think? If it is, what can i do?

1 Answer

Most Helpful Answer

Jenna Beyer, DVM, MBA, cVMA

Answered By Jenna Beyer, DVM, MBA, cVMA

Veterinarian, Certified Veterinary Acupuncturist

Published on August 4th, 2017

It is possible that it is a sebaceous cyst, but they do not typically get that large. Other types of cancer are still possible as well as an abscess. A fever makes me concerned that Luna is very sick. I recommend that she go to a vet as soon as possible for evaluation. The vet may decide to surgically open up the cyst to see what is inside and clean it out. A fine needle aspirate can be done to look at the cells of the mass and give your vet a hint at if this is truly cancerous or not. Bloodwork may be needed to assess overall health and check for other internal medical issues. Antibiotics and anti-inflammatories may be warranted depending on the physical exam and diagnostics.
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