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What is this growth I found behind my cat's leg? Should I worry?

Updated On September 23rd, 2025

Pet's info: Cat | Russian Blue | Male | neutered | 9 lbs

What is this? I found this behind my cats leg im worried

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1 Answer

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Answered By Shaneez Wallani, DVM

Veterinarian

Published on March 11th, 2019

Without further testing, there is no way to tell if this growth is due to infection, trauma or allergy, or if it is a mass. Masses can be of a malignant (cancerous) type that can spread elsewhere and/ or invade the healthy tissue around them, or a more benign (noncancerous) type that is unlikely to spread. I recommend making an appointment for Onxy to see your vet to have the growth tested. In many cases this can be done using a fine needle aspirate, where cells are removed from the growth using a needle and examined under a microscope to determine what it is and to guide treatment. In some cases further testing may be needed to determine the necessary course of treatment, but it is important to get new growths tested in a timely manner, to allow for treatment if necessary.

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