My guinea pig has a lump on its bottom, but isn't bothered. Help!
Updated On September 23rd, 2025
Pet's info: Other | Unknown - Other | Male | unneutered | 4 years and 2 months old
I found a big lump in my guinea pigs bottom, it's ball shaped and it's the same colour as his skin. When I touch it he doesn't seem to be bothered. What should I do?
4 Answers
Most Helpful Answer
Published on July 19th, 2017
Have him examined by your veterinarian or a vet experienced in treating pocket pets. A fine needle aspirate can be done to collect a sample for pathology. This may lead to a diagnosis. In the meantime, make sure he is eating, drinking and eliminating normally.
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on January 4th, 2017
It could be a cyst, infection, benign or cancerous mass. She would ned to be examind by a vet in order to determine the exact cause. Your vet can do a needle aspirate to diagnose and then determine if treatment is needed.
1Pet Parents found this answer helpful
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Published on April 23rd, 2019
Thank you for your question about your guinea pig, and thank you for the photo. I didn't see you mention whether or not there was a wound left when this was removed, or if it was attached directly to the skin and hair. The material looks like it could be an abscess or a mass. An abscess is an infection and this often results from injuries from the cage or from cagemates (such as a bite wound). The masses often occur in older guinea pigs - I didn't see how old your guinea pig was. I would recommend taking your guinea pig to a veterinarian if there is any sign of a wound from where this material was. If this is the case, they can provide your guinea pig with some antibiotics to fight any remaining infection that may be present. If there is no wound present and it just looks like the skin is intact with no defects, then you can monitor your guinea pig for anything that is out of the ordinary for her. This would include changes in attitude, appetite, behavior, poops, or urine. I hope this gives you a place to start, and that your guinea pig feels better soon.
1Pet Parents found this answer helpful
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Published on October 17th, 2018
Without an exam or diagnostics, it is impossible to determine what the lumps may or may not be. Cancer is rare in guinea pigs, though it is possible given her age. Infection or trauma are also possibilities. An exam with your veterinarian would be recommended. A fine needle aspirate can be done in the clinic to collect samples for pathology. This may provide a diagnosis after which treatment options can be discussed.
1Pet Parents found this answer helpful
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