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My 12-year-old cat has a white bump or pus on her back. What is it?

Updated On September 23rd, 2025

Pet's info: Cat | Siamese | Female | spayed | 12 years and 8 months old | 13.22 lbs

Hello, I found some kind of a small white bump/pus on the skin (back side area) of my 12 year old Siamese cat. she has no history of disease/illness, her behavior hasn't changed much. I would like to know what is it, and how to cure it?

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1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on December 20th, 2017

Thanks for using Petco Pet Education Center, formerly Petcoach! It is not possible to know what it is for sure without being able to examine it microscopically. This could be a benign or malignant growth. This is often differentiated by a test called a fine needle aspirate (FNA) which is a pain free, inexpensive and easy procedure which in most cases will help reach a diagnosis. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have her evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck!

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