ConditionMouth & teeth
Oral Leukoplakia
Oral leukoplakia is a thick white patch on the inside of the cheek, gums, tongue or floor of the mouth that cannot be wiped off and has no other identifiable cause. It is most strongly linked to tobacco use and heavy alcohol. Most patches are harmless, but leukoplakia is a potentially precancerous condition: a small percentage turn into oral cancer over time. Any white patch lasting more than 2 to 3 weeks should be examined, and many need a biopsy.
Also called: Leukoplakia, oral white patch, oral potentially malignant disorder
At a glance
- What it is
- A white patch in the mouth that cannot be scraped off and is not explained by another condition.
- Main causes
- Smoking, chewing tobacco, betel quid, heavy alcohol; some have no clear cause.
- Cancer risk
- Small but real; higher for red-and-white (speckled) patches, patches on the tongue sides or floor of mouth, and proliferative verrucous leukoplakia.
- Diagnosis
- Examination and biopsy to check for dysplasia (precancerous change).
- Treatment
- Stop tobacco and alcohol, monitor, and remove patches with dysplasia by surgery or laser.
When to get help
See a doctor within a day or two
- A white or red patch, lump or ulcer in the mouth that is growing, bleeding, hard or painful
- A mouth sore with numbness, a loose tooth without cause, difficulty swallowing or a lump in the neck
Book a routine appointment
- Any white patch in the mouth lasting more than 2 to 3 weeks
- A patch with red areas or a rough, warty surface
- New patches in someone who smokes, chews tobacco or drinks heavily
- Follow-up of a known leukoplakia, especially if it changes
Usually safe to manage at home
- A white coating that wipes off easily, or a patch from biting your cheek that heals within 2 weeks once the cause is removed
What leukoplakia looks like
- a white or gray patch, flat or slightly raised
- does not rub off with gauze
- usually painless
- may be smooth and uniform (homogeneous), or uneven, nodular or mixed with red areas (non-homogeneous or speckled)
Common sites are the inside of the cheeks, gums, sides and underside of the tongue, and floor of the mouth.
White patches that are not leukoplakia
Leukoplakia is a diagnosis of exclusion. Other causes of white patches include:
| Condition | Clues |
|---|---|
| Oral thrush (candidiasis) | Creamy white patches that wipe off, leaving red areas |
| Frictional keratosis | From cheek biting, rough teeth or dentures; resolves when the cause is removed |
| Oral lichen planus | Lacy white lines, often on both cheeks; may be sore |
| Hairy leukoplakia | Ridged white patches on tongue sides; linked to Epstein-Barr virus and weakened immunity |
| Leukoedema | Milky film on cheeks that disappears when stretched; normal variant |
| Chemical burns | From aspirin placed on gums, mouthwashes |
Causes and risk factors
- tobacco: cigarettes, cigars, pipes and especially smokeless (chewing) tobacco
- betel quid or areca nut chewing
- heavy alcohol use, which multiplies tobacco's effect
- older age
- idiopathic leukoplakia with no known cause, which may carry a higher cancer risk, particularly in non-smokers
Cancer risk
Most leukoplakias never become cancer. Studies estimate an average transformation rate of a few percent, but risk varies widely. Higher risk is associated with:
- red-and-white (erythroleukoplakia) or speckled patches
- nodular or warty surface
- location on the side or underside of the tongue or floor of the mouth
- large size
- dysplasia on biopsy, especially severe dysplasia
- proliferative verrucous leukoplakia (PVL): multiple, spreading warty patches, often in older women who do not smoke, with a very high risk of cancer over time
- non-smokers with leukoplakia
Red patches alone (erythroplakia) carry an even higher risk and always need a biopsy.
Diagnosis
- history and examination, including removing possible irritants and reviewing after 2 to 3 weeks
- biopsy: a small sample under local anesthetic shows whether there is dysplasia (abnormal cells) or cancer
- neck examination for enlarged lymph nodes
- referral to an oral medicine specialist or oral surgeon
Brush cytology and special lights can help, but do not replace biopsy for suspicious patches.
Treatment
- stop all tobacco and betel products, and reduce alcohol; some patches shrink or disappear after quitting
- remove irritants: smooth sharp teeth, adjust dentures
- surgical excision or laser removal for patches with dysplasia or high-risk features
- regular monitoring every 3 to 12 months, even after removal, because new patches can develop and cancer can still occur
- photographs to track changes over time
No medicine has been shown to reliably prevent cancer in leukoplakia.
Prevention
- do not use tobacco in any form
- limit alcohol
- see a dentist regularly; dentists often detect leukoplakia first
- check your mouth monthly for patches, sores or lumps
Frequently asked questions
What is oral leukoplakia?
Oral leukoplakia is a white patch inside the mouth that cannot be scraped off and has no other clear cause. It is mostly linked to tobacco and alcohol use. It is considered potentially precancerous, so it needs examination and often a biopsy.
Is leukoplakia cancerous?
Most leukoplakia is not cancer, but a small percentage turns into oral cancer over time. The risk is higher for speckled or red-and-white patches, patches on the tongue or floor of the mouth, and those showing dysplasia on biopsy.
Can leukoplakia go away?
Yes, some patches shrink or disappear after stopping tobacco and removing irritants. Others persist and need monitoring or removal. Even after removal, regular checkups are important because new patches can develop.
How do you know if a white patch in the mouth is serious?
Patches that last more than 2 to 3 weeks, cannot be wiped off, are red and white, rough or warty, bleed, grow, or occur with a neck lump need prompt assessment and usually a biopsy.
Sources
This guide was written from current patient and clinical guidance, including:
- American Academy of Oral Medicine: Leukoplakia patient information
- American Dental Association: Evaluation of potentially malignant disorders in the oral cavity, Clinical Practice Guideline (2017)
- National Cancer Institute: Lip and Oral Cavity Cancer Treatment (PDQ)
- World Health Organization Collaborating Centre: Oral potentially malignant disorders, nomenclature and classification (2020)
- MedlinePlus: Leukoplakia