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DrLucy, Cat Veterinarian
Category: Cat
Satisfied Customers: 618
Experience:  Almost 30 yr as a practicing small animal vet.; experience in gen.medicine, surgery, emerg/
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My cats lower lip is swollen but she doesnt seem to be in

Resolved Question:

My cats lower lip is swollen but she doesn't seem to be in pain and hasn't stopped eating. What could this be from?
Submitted: 8 years ago.
Category: Cat
Expert:  DrLucy replied 8 years ago.
If it is the very front part of her lip, it is very likely to be related to something called the Eosinophilic Granuloma Complex. If you are able to post a photo, I could tell better. Most cases are thought to be triggered by an allergy or by licking the skin when there are minute insect body parts (such as flea parts) on the fur. One of the slang terms for this swelling, when it occurs on the lip, is "rodent ulcer," because people used to associate it with catching mice. If she has fleas, I would get rid of those, but it may take medication to make the swelling go away. Usually steroids, orally or injectably, are the best way to treat it. The good news is that there is no harm to it, as long as it doesn't bother her. I would still recommend going to the vet for treatment, but it does not sound urgent.
Customer: replied 8 years ago.
My cat's name is Lucy! Yes, the spot is in the front, but she doesn't have fleas that I know of. I have never seen any fleas on her or in the house and she doesn't scratch much at all. So if it is an ulcer, it won't go away on its own?
Expert:  DrLucy replied 8 years ago.

I knew she was a great cat!

Anyway, it might go away on its own. It depends on what is causing it, and sometimes there is no way to know. I would feel more comfortable saying to ignore it if you post a close-up photo. I will see if I can find a picture, myself, so you can compare it to your cat.

Expert:  DrLucy replied 8 years ago.

Here is a client-information article from an excellent site called


Here are some photos:


Customer: replied 8 years ago.
<img src="" alt="graphic" width="640" height="480" />
Customer: replied 8 years ago.
Customer: replied 8 years ago.
Expert:  DrLucy replied 8 years ago.

What a cute cat! Her lip does look like an eosinophilic granuloma. As it stated in the Veterinary Partners article, "Keep in mind eosinophilic granuloma represents an inflammatory reaction to proteins deemed foreign by the eosinophils." Given her young age and the fact that she is an indoor cat, without fleas, I would vote for a food allergy as the most likely triggering cause. Here is a link to another Vet Partners article that gives more information on food allergies:

In addition, go through her environment to see whether there is anything you might have overlooked.

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