Petco Text Logo
Petco Pet Logo
  • Two Easy Ways to Start Earning Rewards!

    rewards header
    Become a member today!
    Members-only pricing and offers, personalized care notifications, Vital Care points back on every purchase and more!
    Petco Pay LogoBecome a credit card member today!

    Earn 2X Pals Rewards points at Petco
    when you use Petco Pay!

    APPLY NOW
    Learn More About Petco Pay Benefits

Why is my dog's lip bubble growing? Is it ringworm or something else?

Updated on September 23, 2025

Pet's info: Dog | Shih Tzu | Male | neutered | 9 years and 1 month old | 11 lbs

I went to vet to see why my dog had a bubble on his lip, under his rt. Nostril. Dr. Said it might be ring worm over 2 weeks ago. My question is if it ringworm why would they expose family to wait to see results. What could this be. Bubble is getting bigger, like if I had a neddle, i could pop it

1 Answer

Most Helpful Answer

Makenzie Kurth, DVM

Answered By Makenzie Kurth, DVM

Veterinarian

Published on March 8, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! I can’t say for sure without looking at (and touching) it, but I think this looks less like ringworm at this time and and more like a sebaceous cyst. These are generally benign and often rupture on their own- you can try a gentle squeeze to see if anything comes out.

Since it has gotten much bigger rapidly, it could also be something more scary like a cancer. Even though this is much less likely than a cyst, it’s still worth going into the vet.

Your vet may recommend a cytology (poking the mass with a slim needle and looking at the cells under the microscope) to determine if it needs to be removed or just monitored. If it is a cyst, it is often drained during this process.

I hope this helps and best of luck to you and Ne-yo!
Vote Icon1Pet Parents found this answer helpful

Smart Picks for Smart Questions

Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Share

Styled arrow button