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My cat has a dark, growing ball under his skin. Could it be cancer?

Updated On September 23rd, 2025

Pet's info: Cat | Himalayan | Male

Hi my cat developed a small bump that seems to have grown quite larger. It’s dark in color and when I feel it it feels like a ball under his skin. Does not seem to bother him. Could it be just a growth should I be worried it’s cancerous?

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1 Answer

Most Helpful Answer

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Answered By Dr. Strydom, DVM

Veterinarian

Published on May 29th, 2019

Hello, thank you for using Petco Pet Education Center, formerly Petcoach. I am very worried about this mass due to it's color. That is very abnormal, and like you, I am a bit worried it is cancerous. I suggest you have Sullivan examined by your vet as soon as you can. Best wishes.

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