Oral Lichen Planus: Definition, Causes, and Treatment

What Is Oral Lichen Planus?

Oral lichen planus is a chronic, immune-mediated inflammatory condition that affects the oral mucous membranes — the lining of the cheeks, tongue, gums, floor of the mouth, and palate. It is the oral manifestation of lichen planus, which can also affect the skin, nails, and other mucosal surfaces.

OLP is classified into several clinical forms:

• Reticular — The most common form. Appears as white, lacy lines or web-like patterns (Wickham striae) on the inner cheeks. Usually painless and often discovered incidentally during a dental examination.
• Erosive/Ulcerative — Red, inflamed areas with shallow ulcers. This form is often painful and is the type most likely to prompt patients to seek care.
• Atrophic — Thin, red, diffuse areas of mucosal thinning
• Plaque-like — Thick white patches that can resemble leukoplakia
• Bullous — Fluid-filled blisters (rare)

OLP affects approximately 1-2% of the adult population, with a higher prevalence in women and typically presenting between ages 30 and 60 (Oral Diseases, 2017).

Causes and Risk Factors

The exact cause of oral lichen planus is not fully understood. It is considered an immune-mediated condition in which T-lymphocytes (a type of white blood cell) attack the cells of the oral mucous membranes, but the trigger for this immune response is unclear.

Associated factors and potential contributors include:

• Immune dysregulation — OLP is thought to involve a T-cell-mediated autoimmune response
• Hepatitis C virus — An association between HCV infection and OLP has been reported in some populations, though the relationship varies geographically
• Medications — Certain drugs (NSAIDs, antihypertensives, antimalarials) can cause lichenoid reactions that closely mimic OLP
• Dental materials — Contact with amalgam fillings or other restorative materials can trigger localized lichenoid reactions in some individuals
• Stress — Psychological stress has been associated with OLP flare-ups
• Genetic predisposition — Some studies suggest a familial component

It is important to note that a lichenoid drug reaction or contact reaction is distinct from true OLP, even though they appear similar. A thorough medical and dental history helps distinguish between these entities.

Symptoms

Symptoms depend on the clinical form:

• Reticular OLP — Usually asymptomatic; white lines or patterns may be noticed incidentally
• Erosive OLP — Pain, burning, or stinging sensation, especially when eating spicy, acidic, or hot foods
• Red, swollen, or eroded areas on the inner cheeks, tongue, or gums
• A burning or tingling sensation before visible lesions appear
• Difficulty eating or drinking due to oral discomfort
• Bleeding gums, particularly if the attached gingiva is affected (desquamative gingivitis)

OLP is a chronic condition with periods of flare-up and remission. Some patients experience mild, intermittent symptoms for years, while others have persistent, painful erosive disease that significantly affects quality of life.

Treatment and Prevention

There is currently no cure for oral lichen planus. Treatment focuses on managing symptoms and reducing inflammation.

Topical therapy (first-line):

• Topical corticosteroids — Fluocinonide, clobetasol, or triamcinolone applied directly to lesions. This is the primary treatment for symptomatic OLP.
• Topical calcineurin inhibitors — Tacrolimus or pimecrolimus ointment for patients who do not respond to or cannot tolerate corticosteroids

Systemic therapy (for severe, refractory cases):

• Systemic corticosteroids — Short courses of oral prednisone for severe flare-ups
• Immunosuppressants — Azathioprine, mycophenolate, or methotrexate in rare, severe cases
• Retinoids — Systemic retinoids have shown some benefit in case studies

Supportive measures:

• Avoid spicy, acidic, salty, and abrasive foods that irritate lesions
• Use a gentle, SLS-free toothpaste (sodium lauryl sulfate can exacerbate symptoms)
• Maintain meticulous oral hygiene — plaque accumulation can worsen inflammation
• Manage stress through relaxation techniques or counseling
• If a medication is suspected of causing a lichenoid reaction, discuss alternatives with your physician

Monitoring is an important component of OLP management. A small proportion of cases (estimated at 0.5-2% over 5 years) may undergo malignant transformation to oral squamous cell carcinoma, particularly the erosive form. Regular follow-up examinations — typically every 6-12 months — are recommended, with biopsy of any suspicious changes (Oral Oncology, 2019).

If you notice white lines, red patches, or persistent sores in your mouth, consult your dentist for proper evaluation and diagnosis.