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My guinea pig has blue lumps near nipples, not bothering him?

Updated on September 23rd, 2025

Pet's info: Small Animal | Guinea Pig | Male | unneutered

My guinea pig has two lumps near it's nipples. They don't seem to bother him or hurt him. One is a blueish color

1 Answer

Most Helpful Answer

Miranda Sadar, DVM, DACZM

Answered By Miranda Sadar, DVM, DACZM

Veterinarian

Published on September 5th, 2019

Thank you for reaching out about Piglet - that is a very cute name. I didn't see how old he was? The reason that I ask is that it is common for older guinea pigs, including males, to have problems occur with their nipples. This can include trauma, masses, and crusting. This can be due to hormonal changes, other systemic disease processes, and cancer. I would recommend one of two courses of action - you can continue to monitor the masses for changes (if this occurs, please take Piglet to a veterinarian) or you can take him to a veterinarian for evaluation now, and get additional recommendations based on the exam that s/he performs.
I hope that gives you a place to start, and thank you for using Petco Pet Education Center, formerly Petcoach.
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