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My rabbit has a soft, growing lump on its side. What could it be?

Updated On September 23rd, 2025

Pet's info: Small Animal | Rabbit | Male | unneutered | 4 years and 9 months old | 4 lbs

My rabbit has a lump on Its right side ? Not actually sure if the rabbit is a girl or boy we just assumed it was a boy. He has a soft lump and jumps when you touch it . He’s been acting normal running around and eating as normal so not sure what’s wrong but it Seems to be getting bigger

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on February 17th, 2019

This lump could be a cyst, an abscess, a benign tumor, or a malignant tumor. Any suspicious lumps should be examined by the vet. The vet can perform a test called a fine needle aspirate on it. To do this, the vet sticks a small needle into the lump to get a sample of its cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. Once the cause of the lump is diagnosed, the vet can discuss treatment options if needed. I would give Harry's vet a call in the morning to make him an appointment. Best of luck.

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