Leukoplakia (White Patches in the Mouth)

Types of Leukoplakia

Two main forms are recognized clinically:

• Homogeneous Leukoplakia

  This is the more common form. Patches are uniformly white, flat, and smooth or finely textured. The surface may have slight ridges or fissures but remains consistent in color throughout.

  Homogeneous leukoplakia carries a lower risk of malignant change than other types, though it still requires monitoring.

• Erythroleukoplakia (Speckled Leukoplakia)

  This form presents as a predominantly white patch with interspersed red areas. The red areas indicate erythroplakic change within the lesion — a pattern associated with a significantly higher risk of dysplasia.

  Erythroleukoplakia carries a significantly higher risk of malignant change and should be evaluated promptly. Any patch with prominent red elements requires urgent assessment.

What Causes Leukoplakia

The exact cause is not always identified, but a number of risk factors are strongly associated with its development:

• Tobacco use — smoking and smokeless tobacco (chewing tobacco, paan, gutka) are the most common causes
• Alcohol consumption — particularly in combination with tobacco, which multiplies the risk
• Chronic irritation — from rough dental restorations, ill-fitting dentures, or a broken tooth repeatedly rubbing against oral tissue
• Human papillomavirus (HPV) — certain strains of HPV have been linked to oral leukoplakia
• Sun exposure — relevant for patches that develop on the lips

In some patients no clear cause is found. These cases are described as idiopathic leukoplakia.

Symptoms and Signs to Watch For

Leukoplakia does not usually cause pain in its early stages. Many patches are discovered incidentally during a routine dental examination.

Signs that warrant a dental assessment include:

• A white or grayish patch inside the mouth, on the tongue, or on the gum
• A patch that has been present for more than two to three weeks
• A thickened or raised area of tissue
• A mixed white and red area anywhere in the mouth
• Any area that bleeds when touched or feels persistently sore

Pain or discomfort is more common in patches that have undergone further changes. The absence of pain does not mean a patch is low risk.

Why Leukoplakia Should Not Be Left Untreated

The primary concern with leukoplakia is its potential to undergo malignant transformation — meaning it can, in some cases, develop into squamous cell carcinoma, the most common form of oral cancer.

Research suggests the overall rate of malignant transformation is approximately 6–7%, though this varies considerably depending on the type, location, and individual risk factors involved. Non-homogeneous types — particularly those with a red erythroplakic component — carry a substantially higher risk than homogeneous patches.

Patches on the floor of the mouth, the ventral and lateral surfaces of the tongue, and the soft palate carry a higher transformation risk than those on the cheek lining.

Early detection and monitoring allow any concerning changes to be caught at a stage when treatment is far more straightforward. Leaving an undiagnosed patch untreated removes that window.

How Leukoplakia Is Treated

Treatment depends on the size, location, and characteristics of the patch, and on whether the underlying cause can be identified and removed.

• Removing the Cause

  The first step is identifying and eliminating any contributing factor. Stopping tobacco use, reducing alcohol consumption, and correcting any source of chronic irritation — such as a rough filling or poorly fitting denture — often leads to improvement or resolution of early-stage patches.

• Monitoring and Biopsy

  Not all patches require immediate removal. Your dentist will assess the lesion and, in many cases, recommend a biopsy — a small tissue sample taken from the patch — to determine whether any abnormal or precancerous cells are present. A biopsy is a routine, straightforward procedure and is the only way to confirm whether a lesion requires further treatment.

• Surgical Removal

   Where biopsy results indicate a higher risk, or where the patch is large or in a high-risk location, surgical removal may be recommended. This may be performed using a scalpel, laser, or cryotherapy (controlled freezing of the tissue). Removal does not guarantee that leukoplakia will not recur, particularly if causative factors remain. Regular follow-up is essential.

• Long-Term Follow-Up

  All patients diagnosed with leukoplakia, whether treated surgically or managed conservatively, require ongoing monitoring. The frequency of follow-up visits will be guided by your dental team based on the individual characteristics of the lesion.