Petco Text Logo
Petco Pet Logo

What causes my cat's swollen, sensitive lower lip with yellow patches?

Updated On September 23rd, 2025

Pet's info: Cat | American Longhair | Female | unspayed | 10.3 lbs

My cat has a super swollen lower lip, and has yellowish patches on the protrusion. It doesnt seem to affect her eating or drinking, but shes been eating more frequently, and it is sensitive to the touch, and seems to be bothering her.

This question includes photos that may contain sensitive content. Click to view.

View more to consider that the photos may include sensitive content.

1 Answer

Most Helpful Answer

Image profile

Answered By Catherine Stecyk

Veterinarian

Published on May 25th, 2019

Hello and thank you for reaching out to PetCoach. This looks like what is known as an eosinophilic granuloma, which is a mass of immune cells. Typically these resolve on their own with time, however, this should absolutely be investigated by your primary veterinarian to ensure it is not a more malicious tumor such as a squamous cell carcinoma, which carries a worse prognosis. I've attached a link from Cornell which has more information about cat eosinophlic granulomas for your information: https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/eosinophilic-granuloma-complex I hope this is helpful!

Vote icon

2Pet Parents found this answer helpful

image
Have A Vet Question?

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

Sponsored