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What is this lump on my cat's tail near the base? Is it serious?

Updated On September 23rd, 2025

Pet's info: Cat | Siamese | Male | unneutered | 10 lbs

Found this bump on cats tail (towards base). Any idea what this could be?

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1 Answer

Most Helpful Answer

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Answered By Sarah Derksen, DVM

Veterinarian

Published on October 23rd, 2019

Hi. This appears to be a cyst based on the photo,but hard to say for sure without an exam. These can form in the dermal layer from an over production of oils sebaceous material. This may not be correct based on a photo so I would make an appointment

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