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My guinea pig has a penis growth. Is it serious? Is it contagious?

Updated On September 23rd, 2025

Pet's info: Small Animal | Unknown - Small Animal | Male

Dear Petco Pet Education Center Thank you for your excellent online pet-ressource. The last couple of months my 4 year old guinea pig gradually has developed cauliflower-like displasia on his penis. I am concerned that it might obstruct his urinary tract. What do you think it is? Is there any treatment? Do you think it can be infectious to human? His male cage buddy seems to develop the same now. Thank you very much in advance for your advice in this matter! Kind regards Kaja Fauro

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Answered By Rebeccah Wood

Licensed Veterinary Technician, Registered Laboratory Animal Technologist

Published on May 16th, 2018

Hello there, and thank you for using Petco Pet Education Center, formerly Petcoach! The growth you pictured is rather large, and considering its location, I do recommend having Glottis examined by a veterinarian to determine if it could potentially obstruct his urination. Cauliflower-like lesions are usually papillomas - a type of growth that can pop up on the mucous membranes and genitals and is generally caused by a virus. While the virus itself is usually not life-threatening, the growths it causes can be a nuisance. This would make sense since his cagemate also now has similar symptoms and these viruses can be contagious. There is no treatment for papilloma virus, but unruly growths may be removed by a veterinarian (though they do have the potential to grow back). There is also the potential that the growth is not a papilloma but a malignant tumor, but less likely as his cagemate has the same thing. As long as Glottis is still urinating currently, this is probably not an emergency, but I strongly suggest having him evaluated as soon as possible to prevent future issues. Good luck, and I hope that your piggies stay happy and healthy!

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