[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [General pathology](https://durgical.com/en/general-pathology/) › [Head and neck](https://durgical.com/en/general-pathology/areas/head-neck/) › Leukoplakia and erythroplakia

# Leukoplakia and erythroplakia

- Lesion

Leukoplakia is a white patch and erythroplakia a red patch in the mouth with no other explanation. Both can hide dysplasia, the red one much more often.

Updated Nov 12, 2026

## Key points

- Leukoplakia affects about 3% of people worldwide; a minority (roughly 5–25%) are premalignant; treat every one as precancerous until biopsied.
- Erythroplakia: nearly all (about 90%) show severe dysplasia, carcinoma in situ or early invasive carcinoma.
- Speckled erythroleukoplakia: mixed red and white, also high risk.
- Usual age 40–70, men more than women; tobacco (smoked and smokeless) is the common antecedent.
- Proliferative verrucous leukoplakia: multifocal, progressive, high malignant potential, often in older women.

## What it is

Leukoplakia is a clinical term: a white patch or plaque that cannot be scraped off and cannot be classed as any other disease. Erythroplakia is the red counterpart, flat or slightly depressed, and far more dangerous. Both are the main recognised precursors of oral squamous cell carcinoma, usually linked to tobacco and alcohol, and must be biopsied.

## Structure

- Leukoplakia: white plaque, smooth or wrinkled, sometimes verrucous; histology ranges from hyperkeratosis with acanthosis to dysplasia or carcinoma in situ.
- Dysplasia: loss of maturation, basal crowding, nuclear pleomorphism, hyperchromasia and mitoses above the basal layer.
- Erythroplakia: thin, atrophic epithelium with severe atypia; red colour from dilated vessels and subepithelial inflammation.
- Grading of dysplasia (mild, moderate, severe) is the best available predictor, but subjective.

## Step by step

- Tobacco and alcohol expose the oral mucosa to carcinogens and irritants for years.
- Keratinocytes respond with hyperkeratosis and acanthosis (white patch).
- Mutations accumulate (TP53, CDKN2A, chromosome 3p and 9p loss) and dysplasia appears.
- Thin, highly atypical epithelium with less keratin and more vessels appears red (erythroplakia).
- A fraction progresses over years to invasive squamous cell carcinoma; others regress after tobacco is stopped.

## Leukoplakia vs erythroplakia

| Feature | Leukoplakia | Erythroplakia |
| --- | --- | --- |
| Colour | White, raised | Red, flat or depressed |
| Frequency | Common | Uncommon |
| Dysplasia or carcinoma at biopsy | Minority | Nearly all |
| Risk of cancer | Lower | Much higher |

## Clinical notes

- Common sites: buccal mucosa, floor of mouth, ventral tongue, palate and gingiva.
- Floor of mouth and ventral tongue lesions carry the highest risk.
- Biopsy, tobacco and alcohol cessation, and follow-up are the basis of management.

## Memory aid

White is a warning, red is a red alert.

## Test yourself

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

## How is leukoplakia defined?

A white patch or plaque in the oral cavity that cannot be scraped off and cannot be attributed clinically or histologically to any other disease.

## Why is erythroplakia more worrying than leukoplakia?

Most erythroplakias show severe dysplasia, carcinoma in situ or invasive carcinoma at biopsy.

## What histologic changes define oral epithelial dysplasia?

Loss of normal maturation and polarity, basal cell crowding, nuclear pleomorphism and hyperchromasia, and mitoses above the basal layer.

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## Connections

## Related 6

- [Dysplasia and carcinoma in situ](https://durgical.com/en/general-pathology/dysplasia-and-carcinoma-in-situ/)
- [Precancerous conditions: when chronic inflammation, metaplasia or hyperplasia raise the risk](https://durgical.com/en/general-pathology/precancerous-conditions-when-chronic-inflammation-metaplasia-or-hyperplasia-rais/)
- [Head and neck squamous cell carcinoma](https://durgical.com/en/general-pathology/head-and-neck-squamous-cell-carcinoma/)
- [Oral infections and the mouth in systemic disease](https://durgical.com/en/general-pathology/oral-infections-and-the-mouth-in-systemic-disease/)
- [Laryngeal carcinoma](https://durgical.com/en/general-pathology/laryngeal-carcinoma/)
- [Metaplasia](https://durgical.com/en/general-pathology/metaplasia/)

## 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/)

[← All of general pathology](https://durgical.com/en/general-pathology/)

Educational content on the mechanisms of disease; not a diagnostic or treatment guide and no substitute for a health professional's advice. No doses are given.

Sources: [Oral Cancer](https://medlineplus.gov/oralcancer.html) (MedlinePlus, US National Library of Medicine, 2025); [Head and Neck Cancer](https://medlineplus.gov/headandneckcancer.html) (MedlinePlus, US National Library of Medicine, 2025).

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Representative model, for educational purposes only.

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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/general-pathology/leukoplakia-and-erythroplakia/