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Brown guinea pig nipple discharge and a nearby lump: Should I worry?

Updated On September 23rd, 2025

Pet's info: Small Animal | Guinea Pig | Female | unspayed | 1 year and 4 months old | 2 lbs

So I was just checking my piggie's bladder region and I noticed that her right nipple has brown discharge coming out of it when it is slightly squeezed. Have you experienced this before? Earlier this week I took her to the vet to have a mass be examined to determine if it's cancerous. I will receive those results on Monday. This mass is located close to the nipple that is discharging. Should I be concerned? She's still eating and drinking normally

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1 Answer

Most Helpful Answer

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Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

Veterinarian

Published on November 25th, 2018

It is likely, given your description, that the mass is connected with the mammary gland and is causing the discharge you are noticing. The answer is yes, I have seen it before. Main differentials would include benign or malignant tumors and infections. I would recommend to wait until the results are back before deciding any further course of action. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further. Please find the time to give us a feedback about the consultation as that will be used to improve our service.

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