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My hamster has a lump on its back. What could it be and what to do?

Updated On September 23rd, 2025

Pet's info: Small Animal | Hamster | Male | 2 years and 10 months old | 0.5 lbs

Just noticed my hamster has a kind of lump thing on his back and just wondering what it is?

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2 Answers

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on November 22nd, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be a benign or malignant growth. There is no way of knowing for sure without an examination though this represents a reason to seek veterinary care. This is usually determined with an examination and a fine needle aspirate (FNA) or a biopsy. Treatment depends on the findings up to that point. I recommend you have Tom evaluated by a veterinarian for further assessment and treatment. Good luck and have a good night!

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    Answered By Ricardo Fernandez, DVM

    Veterinarian, Veterinary Oncology Resident

    Published on November 12th, 2018

    Thanks for using Petco Pet Education Center, formerly Petcoach! This could be a benign or malignant growth. There is no way of knowing for sure without an examination though this represents a reason to seek veterinary care. This is usually determined with an examination and a fine needle aspirate (FNA) or a biopsy. Treatment depends on the findings up to that point. I recommend you have Sabrina evaluated by a veterinarian for further assessment and treatment. Good luck and have a good night!

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    1Pet Parents found this answer helpful

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