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# Oral premalignant lesions: leukoplakia and erythroplakia

- Topic

White or red patches in the mouth that do not rub off and have no other cause can turn into cancer and must be biopsied.

Updated Nov 5, 2026

## Key points

- Leukoplakia is a diagnosis of exclusion: first rule out white lesions with a known cause (candidiasis, friction, lichen planus).
- Erythroplakia has the highest malignant transformation rate; in one series most homogeneous red lesions already showed carcinoma in situ or invasive carcinoma.
- Tobacco in any form is the main risk factor; alcohol, chronic irritation and candidiasis add to it.
- Any persistent white or red patch needs a biopsy; the treatment of erythroplakia is surgical excision.

## What it is

Oral potentially malignant disorders are lesions in which mouth cancer is more likely to develop than in normal mucosa. Leukoplakia is a white patch or plaque that cannot be classified as any other definable lesion: it is a diagnosis of exclusion. Erythroplakia is a red, velvety patch; it is rarer but has the highest rate of malignant change of all oral precancerous lesions. Both are strongly linked to tobacco and alcohol.

## White and red oral lesions: telling them apart

| Lesion | Key feature | What to do |
| --- | --- | --- |
| Pseudomembranous candidiasis | White plaques that wipe off, leaving a red base | Antifungal; recheck |
| Frictional keratosis | White patch next to a sharp tooth or denture | Remove the cause; recheck in two weeks |
| Leukoplakia | White patch that does not wipe off and has no other cause | Biopsy; stop tobacco and alcohol |
| Erythroplakia | Red, velvety patch, often on soft palate, floor of mouth or cheek | Biopsy and excision |
| Oral carcinoma | Ulcer or lump that persists, may bleed or be indurated | Urgent referral |

## In clinical practice

- Patches on the floor of the mouth and the lateral and ventral tongue deserve particular attention because these are frequent sites of oral cancer.
- A lesion that seems to improve after removing a cause must still be rechecked until it disappears.

## Next step / Initial management

- Examine the whole mouth, document size, colour and site (a photo helps follow-up) and look for a removable cause: candidiasis, sharp tooth, ill-fitting denture.
- Treat a removable cause (antifungal for candidiasis, dental correction) and recheck in about two weeks; a patch that persists needs biopsy.
- Advise stopping tobacco in all forms and alcohol; this is part of treatment.
- Refer to oral surgery, maxillofacial surgery or otolaryngology for biopsy: urgently (within two weeks) for any red patch, mixed red-white patch, ulcer, induration or a patch that persists after removing the cause.
- After diagnosis, follow-up is long term because the risk of cancer remains.

## Test yourself

Think of the answer, then tap the question to see it.

## Why is oral leukoplakia called a diagnosis of exclusion?

Because it is defined as a white patch that cannot be classified as any other definable lesion; candidiasis, friction and other causes must be ruled out first.

## Which oral premalignant lesion has the highest risk of malignant transformation?

Erythroplakia, the red velvety patch; many already show carcinoma in situ or invasive carcinoma when first biopsied.

## A smoker has a white patch on the side of the tongue that does not wipe off and persists after smoothing a sharp tooth. Next step?

Biopsy, through referral to oral or maxillofacial surgery or otolaryngology, plus advice to stop tobacco and alcohol.

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## Connections

## Related 1

- [Head and neck cancer: red flags and urgent referral](https://durgical.com/en/ent/head-and-neck-cancer-red-flags-and-urgent-referral/)

## Related conditions 1

- [Head and neck squamous cell carcinoma (oral cavity and oropharynx, HPV)](https://durgical.com/en/conditions/head-and-neck-squamous-cell-carcinoma/)

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Educational content; it does not replace a medical assessment and is not a clinical instruction. For a real case, follow current guidelines and specialist advice.

Sources: [Oral Leukoplakia](https://www.ncbi.nlm.nih.gov/books/NBK442013/) (StatPearls (NCBI Bookshelf), 2023); [Oral erythroplakia: a review (Oral Oncology)](https://pubmed.ncbi.nlm.nih.gov/15975518/) (PubMed, US National Library of Medicine, 2005); [Oral Cancer](https://www.nidcr.nih.gov/health-info/oral-cancer) (National Institute of Dental and Craniofacial Research (NIH), 2024); [Tongue Cancer](https://www.ncbi.nlm.nih.gov/books/NBK562324/) (StatPearls (NCBI Bookshelf), 2023).

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License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/ent/oral-premalignant-lesions-leukoplakia-and-erythroplakia/