Bump on Gums: Possible Causes and What to Do

A bump on your gums does not automatically mean a tooth infection. It may be swelling from an abscess, a reaction to repeated irritation, a benign tissue growth or a projection of bone beneath the tissue. Appearance offers clues, but a new or unexplained lump needs a dental assessment—not a diagnosis from a photo. MSD Manual

When to get help

• Get emergency medical care now if you have trouble breathing, speaking or swallowing; substantial swelling inside your mouth; marked difficulty opening your mouth; or a swollen or painful eye or new vision problems. These are warning signs listed in NHS dental-abscess guidance.
• Ask for an urgent dental appointment if the bump comes with tooth or gum pain, pus or a bad taste, fever, or facial or jaw swelling. A suspected abscess needs dental treatment. NHS
• Arrange an assessment for an unexplained lump even if it is painless. Do not keep monitoring a growth that persists beyond one to two weeks. A lump, red or white patch, or nonhealing sore can have many causes, including oral cancer; those changes need examination rather than reassurance based on appearance. MSD Manual, NHS

Possible causes—and how they differ

An abscess involving a tooth or the gums

An abscess is a pocket of pus caused by infection. Nearby gum swelling, redness, pain and a bad taste are possible clues. Importantly, an infection around a tooth root may not be painful, so lack of toothache does not rule it out. ADA MouthHealthy, American Association of Endodontists

Treatment depends on the source. A gum-related infection may require cleaning between the tooth and gum and drainage; infection inside a tooth may require root canal treatment or removal of the tooth. The bump alone does not tell you which treatment is appropriate. ADA MouthHealthy, NHS

For the narrower question of infection in a previously treated tooth, see root canal infection signs.

A firm, smooth bump from irritation: oral fibroma

An oral fibroma is a benign, scar-like reaction to long-standing irritation. It can occur on the gums and is usually firm, smooth and similar in color to the surrounding mouth lining. It often causes no symptoms beyond the noticeable lump.

A dentist may recommend a biopsy—taking tissue for laboratory examination—to confirm the diagnosis or remove the growth. If removal is needed, the source of irritation also needs attention to reduce recurrence. A confirmed fibroma generally does not disappear on its own. DermNet

A red, fleshy growth that bleeds easily: pyogenic granuloma

Despite its name, a pyogenic granuloma is not an infection. It is a benign overgrowth of small blood vessels that can develop on the gums, including during pregnancy. It is often painless but bleeds easily; its surface may also become ulcerated.

Have it examined rather than assuming it is ordinary gum inflammation. Treatment may involve removing the growth and addressing local irritants. Some pregnancy-associated lesions resolve after childbirth, but that does not establish the diagnosis of an individual bump. DermNet

A hard, slow-growing bump on the inner lower jaw: torus

A torus is a rounded projection of bone. On the lower jaw, it typically sits beside the tongue rather than at the outer gumline. It is hard and slow-growing.

Once identified as a torus, this harmless growth can usually be left alone unless it gets scraped during eating or interferes with a denture. A newly noticed hard lump still needs identification before you assume it is normal anatomy. MSD Manual

A swelling over a child’s incoming tooth: eruption cyst

An eruption cyst forms in the soft tissue over an erupting tooth. Its color can range from normal tissue color to blue-black or brown, depending on blood in the fluid.

After a dentist confirms the cause, treatment is usually unnecessary because the tooth comes through the cyst. An enlarging cyst that causes discomfort may need a small surgical procedure. American Academy of Pediatric Dentistry

What to do before—and during—the appointment

Leave drainage or removal to a dental professional. While waiting for care, clean gently with a soft toothbrush. If eating hurts, choose soft foods and avoid very hot or cold foods and drinks. These measures can improve comfort but do not treat an abscess. NHS

Start with your general dentist. Bring a photo if the bump changes or disappears before the visit, and note when it started, whether it has returned, and any bleeding, discharge or nearby tooth symptoms.

Useful questions include:

• “Does this seem to come from the tooth, gum tissue or underlying bone?”
• “What examination findings support that explanation?”
• “Would an X-ray or biopsy change the diagnosis or treatment?”
• “If we monitor it, when should it be reviewed, and what changes should prompt an earlier call?”