Lumps and Cysts on a Cat's Mouth, Jaw, and Face

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

A cat lump on the mouth, jaw, or face is a swelling or mass that can come from many causes, including dental disease, infection, cysts, and tumors. Some lumps are harmless, but others grow fast and spread, so any new lump in this area deserves a veterinary exam. This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

• Any lump on the mouth, jaw, or face should be examined by a veterinarian, because oral disease is treated most effectively with early diagnosis [1].
• Cysts and benign tumors are common, but malignant tumors of the mouth also occur in cats and can grow quickly [2][3].
• A biopsy (tissue sample) is the only reliable way to tell a cyst from a malignant tumor.
• Red flags that mean go now: trouble breathing, drooling with blood, a mass that appeared or grew within days, or refusal to eat.
• Do not squeeze, poke, or try to drain a lump at home. That can cause pain, bleeding, and infection.

What a Lump on a Cat's Mouth, Jaw, or Face Looks Like

Lumps in this area can be easy to miss. Cats often hide oral pain, and many keep eating until a mass is large. You may notice a bump on the lip, gum, tongue, or hard palate. You may feel a firm spot along the jawbone. Sometimes the first sign is facial swelling on one side, which can push the eye, nose, or cheek outward [4].

Other signs that come with these lumps include bad breath, drooling, blood-tinged saliva, dropping food, chewing on one side, pawing at the mouth, and enlarged lymph nodes in the region [1]. A cat with a painful mouth may resist having the area touched [1].

What Is Normal

Not every bump is a problem. Cats can have normal anatomy that feels like a lump, such as the bony ridge of the jaw or a normal salivary gland. Small, soft, movable bumps on the skin of the face are often benign skin tumors or cysts [2]. The key difference is change over time. A lump that stays the same size for months is less worrying than one that doubles in a week.

Common Causes of a Cat Lump on the Mouth, Jaw, and Face

The table below groups the main causes. Urgency reflects how fast a veterinarian should see the cat, not how serious the cause always is.

Cysts in a Cat's Mouth and Face

A cyst is a closed pocket of fluid or semi-solid material. In cats, cysts can form on the skin and around some benign skin tumors, including basal cell tumors [2]. A cyst on the jaw or lip often feels smooth and round. It may stay the same size for a long time. Cysts are not cancer, but they can become infected or press on nearby teeth and bone. A cyst that drains a thick or bloody fluid, or that keeps coming back, needs a veterinary exam.

Cysts in a Cat's Throat

A lump in the throat is harder to see than one on the lip. Signs include a change in voice, noisy breathing, trouble swallowing, or a bulge in the neck. A mass in the windpipe area can cause severe breathing problems. One report described a cat with a tracheal tumor that caused respiratory distress and a narrowed windpipe [8]. Any cat with noisy or labored breathing needs emergency care.

Mouth Tumors in Cats

Tumors are abnormal growths of cells. Tumors of the skin and the tissue just under the skin are the most common tumors in cats, partly because they are easy to see [2]. Tumors inside the mouth are less visible but often more serious. Feline oral squamous cell carcinoma is one of the most common malignant tumors in cats, and most cats with it die of the disease within a few months of diagnosis [6]. Other malignant tumors, such as oral carcinosarcoma, can grow rapidly and invade the jawbone [3]. Benign tumors also occur. A capillary hemangioma, for example, is a benign dark red growth that can appear on the gum near a tooth [5].

A Cat Cyst on the Jaw Versus a Tumor

This is the question owners ask most. A cyst is usually smooth, slow growing, and does not invade bone. A malignant tumor often grows fast, feels firm or fixed, may ulcerate and bleed, and can destroy the jawbone [3]. But these rules are not perfect. Some benign tumors grow quickly and ulcerate [2], and some cancers start as small, quiet lumps. Only a biopsy can tell them apart.

Red Flags That Make It an Emergency

Call an emergency clinic right away if you see any of these:

• Open-mouth breathing, noisy breathing, or a blue or gray gum color. A mass near the throat or windpipe can block airflow [8].
• Heavy bleeding from the mouth that does not stop.
• A lump that appeared or doubled in size within a few days [3].
• Inability to eat or drink for more than 24 hours.
• One-sided facial swelling with nosebleeds, which can point to a nasal mass or fungal infection [4].
• A jaw that feels loose, shifted, or broken.

For a cat that may have swallowed a toxin or a foreign object, contact a poison control service. The ASPCA Animal Poison Control Center is available at (888) 426-4435, and the Pet Poison Helpline is available at (855) 764-7661. A consultation fee may apply.

What You Can Safely Do at Home While You Wait

You cannot diagnose this at home, but you can keep your cat comfortable and safe.

• Look, do not touch. Shine a light and gently lift the lip if your cat allows it. Do not squeeze, poke, or try to drain the lump.
• Note the details. Write down when you first saw it, its size compared to a pea or grape, whether it is firm or soft, and whether it bleeds.
• Take photos. A photo with a coin or ruler for scale helps your veterinarian track change.
• Offer soft food. Warm, soft food or a pate-style diet may be easier to eat if the mouth is sore.
• Keep water easy to reach. Offer several water bowls in quiet spots.
• Do not give human pain relievers. Many are toxic to cats. Your veterinarian will choose a safe pain medication and calculate the dose from your cat's weight and health.
• Watch breathing closely. If your cat starts breathing with its mouth open or makes noise with each breath, go to an emergency clinic.

What the Veterinarian Will Check and Test

Your veterinarian will start with a full physical exam, including a complete oral exam. Oral diseases are treated most effectively when found early, and a mouth exam should be part of routine care [1]. The vet will check the lips, gums, tongue, palate, and the back of the throat. They will feel the jawbone and the lymph nodes in the neck, which may be enlarged with inflammation or cancer [1].

Tests Your Vet May Recommend

• Fine-needle aspiration. A thin needle collects cells from the lump. This is quick and often done without sedation.
• Biopsy. A tissue sample gives the most reliable diagnosis. This is how a cyst, a benign tumor, and a malignant tumor are told apart.
• Dental X-rays. These show tooth roots, bone loss, and masses inside the jaw.
• Blood work and urinalysis. These check overall health before anesthesia or treatment.
• Imaging. A CT scan can show how deep a mass goes and whether bone is involved. In one cat, CT found a nasal mass and areas of bone destruction that explained the facial swelling [4].
• Culture or special staining. If a fungal infection such as blastomycosis is suspected, special tests on the tissue can confirm it [4].

Treatment depends on the diagnosis. Benign tumors such as basal cell tumors are often cured with surgery [2]. A benign hemangioma can be removed with a marginal excision [5]. Malignant tumors may need surgery, radiation, or chemotherapy, and the outlook is often guarded [6]. Infections are treated with the right antimicrobial drug. One cat with nasal blastomycosis improved after 8 months of itraconazole treatment [4].

If the lump turns out to be a skin growth on the face instead of inside the mouth, these guides can help you plan the next step: Cat Skin Bumps and Lumps: When to See a Vet and When to Monitor and Cat Skin Bumps and Lumps: What the Vet Will Do and How Much It Costs. If your cat also has bad breath or red gums, see Dental Disease In Dogs And Cats.

Prevention and Monitoring

You cannot prevent every lump, but you can catch problems early.

• Check the mouth monthly. Lift the lips and look at the gums, teeth, and tongue. Make it calm and quick, with a treat after.
• Brush your cat's teeth if your cat tolerates it. Gum disease is the most common oral problem in cats [1].
• Keep dental checkups. A complete oral exam should be part of routine physical exams [1].
• Track any lump. Measure it, photograph it, and note the date. Bring your notes to the visit.
• Know your cat's risk factors. Basal cell tumors are more common in older cats, and domestic longhair, Himalayan, and Persian cats are among the breeds most at risk [2].
• Watch young cats with dental anomalies. Jaw swelling from bone infection can occur within the first 4 years of life in cats with persistent baby teeth and impacted adult teeth [7].

Limitations and When to Contact a Veterinarian

This article cannot tell you what your cat's lump is. Only an exam and often a biopsy can do that. Individual cases need a veterinarian who can see and feel the mass.

Contact a veterinarian the same day if you find a new lump on the mouth, jaw, or face, if your cat has bad breath with drooling, or if your cat is eating less than usual [1].

Go to an emergency clinic now if your cat has trouble breathing, heavy bleeding from the mouth, a jaw that looks broken or shifted, or a lump that grew within days [3][8].

Schedule a routine visit if a lump has been stable for weeks but you want it checked, or if your cat is due for a dental exam. Early diagnosis gives your cat the best chance, because oral disease often stays hidden until it is advanced [1].

Frequently Asked Questions

Is a lump on my cat's mouth always cancer?

No. Many lumps are cysts, benign tumors, or swelling from dental disease or infection. Basal cell tumors, for example, are benign, and hemangiomas are benign growths that can be removed with surgery [2][5]. Still, malignant tumors of the mouth do occur in cats, so every lump needs an exam.

Can a cyst in my cat's mouth burst on its own?

Yes, a cyst can rupture and drain, and it may look better for a few days before swelling again. Do not squeeze it, because that can spread infection and cause bleeding. A cyst that keeps refilling or draining needs veterinary care.

How fast do mouth tumors grow in cats?

Some grow very fast. One reported oral carcinosarcoma in a cat was described as a rapidly growing mass on the lower jaw [3]. Feline oral squamous cell carcinoma also tends to behave aggressively, and most affected cats die within a few months of diagnosis [6]. Speed of growth is one reason a new lump should be seen quickly.

Will my cat need anesthesia for a biopsy?

Often yes, especially for a mass deep in the mouth or jaw. A biopsy of a surface lump may be done with local numbing. Your veterinarian will decide based on the location, your cat's health, and whether dental X-rays or imaging are also needed.

Can facial swelling in a cat be caused by an infection?

Yes. Infections of the tooth root, bone, or nasal cavity can cause one-sided facial swelling. One cat with nasal blastomycosis, a fungal infection, had facial swelling and nosebleeds, and improved after months of antifungal treatment [4]. Bone infection of the jaw is another cause of swelling, and it is often linked to dental anomalies in young cats [7].

Related Articles

• Cat Skin Bumps and Lumps: When to See a Vet and When to Monitor
• Cat Skin Bumps and Lumps: What the Vet Will Do and How Much It Costs
• Dental Disease In Dogs And Cats
• Ear Polyps in Cats: Signs, Diagnosis, Surgery, and Recurrence
• Cat Skin Rash with Bumps: Common Causes and Next Steps
• Cat Shaking Head And Scratching Ear
• Lump on a Cat's Tongue or in the Mouth: What to Do
• Tumors on a Cat's Mouth, Jaw, or Tongue: What to Do
• Cat Bump on the Lip or Mouth: Causes and Next Steps

References

1. Disorders of the Mouth in Cats - Cat Owners. Merck Veterinary Manual.
2. Tumors of the Skin in Cats - Cat Owners. Merck Veterinary Manual.
3. Morphological and Immunohistochemical Characterization of an Oral Metastatic Carcinosarcoma in a Cat. Journal of comparative pathology, 2022.
4. Epistaxis and Facial Swelling Due to Nasal Blastomycosis in a Cat. Journal of the American Animal Hospital Association, 2024.
5. Capillary gingival hemangioma in a cat. The Journal of veterinary medical science, 2023.
6. Whole Exome Sequencing of Feline Oral Squamous Cell Carcinoma Reveals Genomic Parallels With Human Head and Neck Squamous Cell Carcinoma. Veterinary and comparative oncology, 2026.
7. Characterization of Oral Pathology in Cats Affected by Patellar Fracture and Dental Anomaly Syndrome (PADS). Journal of veterinary dentistry, 2023.
8. Tracheal Squamous Cell Carcinoma in an Adult Cat. Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association, 2026.

Further Reading

• Merck Veterinary Manual: Cat Owners
• Cornell Feline Health Center: Health Information
• American Veterinary Medical Association: Pet Care