My cat has a swollen bottom lip with acne. What could it be?

This condition is called Eosinophilic Granuloma Complex , also known as "rodent ulcer", The exact cause of feline eosinophilic granuloma complex is unknown. Some research studies suggest that a form of allergic response (hypersensitivity reaction) may be involved in the majority of cases. This is more likely in cases that are recurrent. Other studies suggest that the condition may at least be partially genetic or inheritable.

Flea and insect control is very important in the treatment of feline eosinophilic complex. This is due to the suspected hypersensitivity reaction cause of the condition. Insect bites can trigger an exaggerated immune response in affected cats, causing or worsening clinical signs.

Some cats respond to elimination or hypoallergenic diets, suggesting an underlying food allergy as the cause. Most cats diagnosed with feline eosinophilic granuloma complex benefit from a hypoallergenic food trial.

Corticosteroids are the most common treatment to control the symptoms of eosinophilic granuloma complex. you will need to visit your vet to get this treatment.