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My dog has a red lip spot growing like a cold sore. What could it be?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | 1 year and 2 months old | 20 lbs

My dog got a red sopt on his top lip sort of like a cold sore but has got bigher what is this

1 Answer

Most Helpful Answer

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Answered By Daniel Fonza, DVM

Veterinarian

Published on March 17th, 2018

Hi there and thank you for using Petco Pet Education Center, formerly Petcoach to address your concern. Without seeing a picture of what you are describing it is difficult to say for sure what this could be. I suspect, due to Blue's age, that this could be a viral papilloma, histiocytoma or pimple-like growth. In all 3 cases, it should resolve on its own. It could be something other than these 3 possibilities. If the spot does not resolve or it worsens, I would recommend having a veterinarian examine Blue to that the most appropriate diagnostic and treatment recommendations can be made. I hope this helps guide you in the right direction! Please let me know if you have any other questions or concerns and I would be more than happy to help you further.

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