Hairy Leukoplakia

Overview

Hairy leukoplakia is a condition in which white patches form on the tongue, usually along its sides. The patches often have a ridged, folded, or hairy appearance, which gives the condition its name. Unlike many other white mouth patches, they cannot be wiped or scraped off.

Hairy leukoplakia is caused by the Epstein-Barr virus, a common virus that many people carry. It typically appears when the immune system is weakened, most notably in people with HIV, but also in others with reduced immunity. The patches themselves are usually painless and harmless, but because they often signal an underlying immune problem, finding them is an important reason to check overall health. Hairy leukoplakia is not a cancer and is not considered precancerous.

Symptoms

The patches are usually the only finding and often cause no discomfort. Features include:

• White patches on the sides of the tongue, sometimes on the top or underside.
• A ridged, folded, or hairy texture.
• Patches that cannot be scraped or wiped off.
• Usually no pain, though some people notice mild irritation or a change in taste.

Because it is usually painless, hairy leukoplakia may be found by chance during a dental or medical exam. Its presence can be the first sign that prompts testing for an underlying immune condition.

Causes

Hairy leukoplakia is caused by the Epstein-Barr virus (EBV), the same virus that causes mononucleosis. Most people are infected with EBV at some point and carry it quietly for life without problems.

When the immune system becomes weakened, the virus can become active in the cells lining the tongue and produce the characteristic patches. This is why hairy leukoplakia is closely linked to conditions that reduce immunity, especially HIV infection, but also organ transplants and certain medications that suppress the immune system.

Risk Factors

• HIV infection, especially when not treated
• A weakened immune system from any cause
• Organ or stem cell transplant
• Use of immune-suppressing medications, including long-term steroids
• Other conditions that lower immunity

Diagnosis

Diagnosis is often based on the appearance and location of the patches, with tests to confirm and to look for an underlying cause.

• Examination: The ridged white patches on the sides of the tongue that cannot be wiped off are often characteristic.
• Biopsy: A small tissue sample may be taken to confirm the diagnosis and rule out other conditions.
• Testing for underlying causes: Including HIV testing, since hairy leukoplakia can be a first sign of immune suppression.

It is important to distinguish hairy leukoplakia from oral thrush, which can be wiped off, and from other oral patches.

Treatment

Hairy leukoplakia itself is usually harmless and often does not require direct treatment. The main focus is on the underlying immune condition.

• Treating the underlying cause: For people with HIV, effective treatment that strengthens the immune system often makes the patches improve or disappear.
• Antiviral medication: May be used in some cases to reduce the patches, though they can return if immunity remains low.
• Monitoring: Regular checks of the mouth and overall health.

Because the patches signal reduced immunity, the most valuable step is identifying and managing the cause.

Prevention

There is no specific way to prevent hairy leukoplakia, but supporting immune health lowers the chance it will appear or return:

• For people with HIV, take antiretroviral treatment as prescribed to keep the immune system strong
• Manage other conditions and medications that weaken immunity with your clinician
• Maintain good oral hygiene and attend regular dental check-ups
• Avoid smoking, which can irritate the mouth

When to See a Doctor

See a doctor or dentist if you notice white patches on your tongue that do not wipe off or do not go away, especially if you have a weakened immune system or risk factors for HIV. It is important to be evaluated because:

• Hairy leukoplakia can be the first sign of an undiagnosed immune problem, including HIV
• Other mouth patches can look similar and may need different treatment
• Any patch that is painful, bleeding, growing, or hardened should be checked promptly to rule out other conditions

Related Topics

Frequently Asked Questions

References

1. MedlinePlus, U.S. National Library of Medicine. Oral hairy leukoplakia.
2. Centers for Disease Control and Prevention (CDC). HIV and Opportunistic Infections.
3. StatPearls, National Library of Medicine. Oral Hairy Leukoplakia.
4. National Institute of Dental and Craniofacial Research (NIDCR).