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What's this fast-growing, red lump on my dog's lip? Is it serious?

Updated On September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Male | unneutered | 4 years and 4 months old | 75 lbs

Hi, i have a 4 year old lab retriever named Ruger. 3 days ago I noticed a hard marble sized ball under the skin of his lip. There's no wounds on inside or outside and his teeth look good. It doesn't seem to be tender or bothersome but it's growing fast. Each day it's doubling in size. Today it's almost like a golf ball and I noticed it developed a dime sized red spot. Could this be an infection, a spider bite or could it be serious and i should worry about?Any info is greatly appreciated.Thank u

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1 Answer

Most Helpful Answer

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Answered By Jacqueline Nobles, DVM, DACVECC

Veterinarian, Board-Certified Emergency/Critical Care Specialist

Published on May 12th, 2018

Hello, From your description and what I appreciate from the picture, the lump is red and swollen. It could be been an insect bite that has gotten infected (seems most likely), foreign object or a mass(less likely). Given that the swelling has worsened, I would advise you to have Ruger examined by a veterinarian.

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