Feline Acne, Stomatitis, and Other Cat Mouth Conditions

Feline Chin Acne

Feline acne is a common condition causing blackheads and sometimes papules or pustules on a cat's chin and lower lip. The cause is multifactorial: overactive sebaceous glands, inadequate grooming of the chin area (which is difficult for cats to reach), contact allergy (particularly to plastic food bowls), and stress. Mild cases appear as black specks on the chin that look like dirt. Severe cases involve inflamed, infected follicles requiring veterinary treatment. For mild cases: switch to stainless steel or ceramic food and water bowls, clean the chin area regularly with a cotton ball dampened with dilute chlorhexidine or gentle witch hazel. For inflamed or infected cases, veterinary-prescribed topical or systemic treatment is needed.

Stomatitis

Feline stomatitis (more precisely called feline chronic gingivostomatitis, FCGS) is one of the most painful conditions in veterinary medicine. It involves severe, diffuse inflammation throughout the oral cavity — not just the gums adjacent to teeth, but the entire mucous membrane lining of the mouth. Cats with stomatitis typically drool heavily, have extremely bad breath, stop or significantly reduce eating, paw at their mouths, and become dramatically less active. The cause appears to involve an abnormal immune response to oral bacteria, possibly with a viral component (calicivirus and herpesvirus are associated). Treatment in mild cases involves aggressive dental cleaning with extractions of severely affected teeth. In moderate to severe cases, full-mouth tooth extraction (FMTE) — removing all or nearly all teeth — resolves the condition in approximately 60-80% of cats, with dramatic improvement in quality of life.

Oral Ulcers

Oral ulcers in cats have multiple causes: calicivirus infection (common, particularly in multi-cat households and shelters), stomatitis, renal disease (uremic ulcers from kidney failure), and certain toxin exposures. Calicivirus ulcers are most common on the tongue and hard palate, appear suddenly, and often accompany upper respiratory symptoms. Most resolve within 1-2 weeks with supportive care. Recurring oral ulcers or ulcers in cats without respiratory signs warrant full veterinary evaluation including bloodwork.

Eosinophilic Granuloma Complex

This immune-mediated skin and mucous membrane condition can affect the lips in cats, causing a distinctive raised, ulcerated lesion typically on the upper lip (indolent ulcer). It's rarely painful despite its dramatic appearance. Treatment with corticosteroids is usually effective, and identifying and addressing underlying triggers (often allergies) reduces recurrence.