Oral Cysts and Tumours: Assessment of Lumps, Swelling and Jaw Lesions

A lump, swelling, or unusual area in the mouth can be worrying. Many oral lesions are harmless or related to a common dental problem, but any unexplained change deserves proper assessment—especially if it persists, grows, bleeds, or causes pain.

When I see a patient with a possible cyst or tumour, I focus on finding an accurate diagnosis first. The word “tumour” simply means an abnormal growth; it does not automatically mean cancer.

What is an oral cyst?

An oral cyst is a sac-like lesion that may contain fluid or soft material. Cysts can develop in the jawbone, around an impacted tooth, near the roots of infected teeth, or in soft tissues of the mouth.

Some cysts are found incidentally on a dental X-ray. Others cause swelling, pressure, pain, infection, or changes to nearby teeth. Even a painless cyst may need treatment if it is growing or affecting the jawbone.

What symptoms should be checked?

Please arrange an assessment if you notice:

• A lump or swelling in the mouth, jaw, gum, lip, cheek, or palate
• Facial swelling that does not settle
• A change in the fit of your teeth or denture
• A persistent sore, thickened area, or unexplained bleeding
• Numbness or altered sensation in the lip, chin, tongue, or face
• A tooth that becomes loose without a clear reason
• Pain, pressure, or repeated infection in one area
• A lesion or swelling that continues to enlarge

Not every lesion causes pain. In fact, many jaw cysts develop gradually and are first discovered during routine dental imaging.

How are cysts and tumours assessed?

Assessment starts with a detailed history and examination. I may review dental X-rays or recommend more detailed imaging, such as a CT scan, depending on the location and appearance of the lesion.

In some cases, a biopsy is needed. This involves taking a small tissue sample so it can be examined under a microscope. A biopsy is often the most reliable way to determine exactly what a lesion is and what treatment it requires.

What treatment may be needed?

Treatment depends entirely on the diagnosis. Options may include monitoring, medication, removal of an associated tooth, surgical removal of the cyst or lesion, or referral for additional specialist care.

If surgery is required, I explain the procedure, possible effects on nearby teeth or nerves, expected recovery, and how we will monitor healing afterward. The goal is to treat the problem thoroughly while preserving healthy structures whenever possible.

Do not self-diagnose a mouth lump

Online information can be helpful, but it cannot replace an examination. Mouth lesions can look similar even when their causes are very different. Prompt assessment provides reassurance when a change is harmless and timely treatment when it is not.