Understanding Oral Lichen Planus: Clinical Features, Etiology, and Diagnosis
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| Reticular Type of Oral Lichen Planus |
What is Oral Lichen Planus?
Oral lichen planus is a disease characterized by chronic inflammation of the oral mucosa, resulting from a T-cell-mediated autoimmune reaction. The immune response against epithelial cells leads to basal cell degeneration and disruption of mucosal integrity. It usually occurs for unknown reasons and is characterized by damage to the mucosa covering the cheeks, gums, and tongue, and the appearance of white lesions.
The disease typically presents as:
- In middle-aged and older individuals
- More common in women than men
- Chronic and progressing with exacerbations
a clinical picture.
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| The lesion in this image is the erosive (ulcerative) form of Oral Lichen Planus. Prominent erythema (redness) in the gingival area, Superficial erosion/ulcer appearance, Disruption of epithelial integrity in the areas indicated by arrows, Absence of prominent Wickham striae as in the reticular type, Gingival involvement → desquamative gingivitis pattern | This form: Is the most symptomatic type, Pain and burning are common in patients, Complaints worsen while eating |
How to Diagnose Oral Lichen Planus?
The clinical findings of OLP are quite typical, but some forms can be confused with other oral lesions.
The most common symptoms are:
- White, lace-like lines in the mouth (Wickham striae)
- Bilateral symmetrical lesions on the cheek mucosa
- Burning sensation (especially increased by spicy/acidic foods)
- Pain (more pronounced in the erosive type)
- Redness and superficial ulcers
- Gum involvement (desquamative gingivitis)
- Most common locations:
- Buccal mucosa (most common)
- Tongue (especially dorsum and lateral edges)
- Gums
- Lip mucosa
- Rarely palate
The asymptomatic reticular form is often discovered incidentally, while the erosive form causes significant discomfort to the patient.
What are Wickham's Striae?
Wickham's striae are fine, white, lace-like (reticular) lines seen especially in oral lichen planus and cutaneous lichen planus. These lines are usually seen bilaterally and symmetrically, most often in the buccal mucosa inside the mouth.
How do they form?
Wickham's lines arise due to hyperkeratosis (increased keratin) in the epithelium and changes in the granular layer. Because they reflect light differently, they appear clinically as white, shiny lines.
What is their clinical significance?
Wickham’s striae is one of the most characteristic findings of oral lichen planus.
It is particularly prominent in the reticular type.
It is often painless and may go unnoticed by patients.
It provides an important clue in differential diagnosis (e.g., leukoplakia or candidiasis).
Appearance features:
- Lace-like shape
- Fine, white lines
- Interconnected reticular structure
- Usually symmetrical distribution
In summary, Wickham’s striae is a highly valuable, unique clinical finding in the recognition of oral lichen planus and strongly supports the diagnosis for an experienced clinician.
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| Reticular Type of Oral Lichen Planus |
What are the Underlying Causes of Oral Lichen Planus?
The exact cause of OLP is not fully known. However, a multifactorial pathogenesis is involved.
Autoimmune Mechanisms
The primary mechanism is the attack of basal keratinocytes by CD8+ T lymphocytes. This causes epithelial damage and inflammation.
Genetic Predisposition
Association with certain HLA types has been reported. Although family history is rare, a genetic predisposition may play a role.
Infections
A relationship with Hepatitis C, in particular, has been shown in some populations.
Viral triggers can activate the immune response.
Drugs (Lichenoid Reactions)
Can cause OLP-like lesions:
- Antihypertensives
- Antimallarial drugs
- Antifungals
- Antiparasitics
- Anti-seizure medications
- Beta-blockers
- Diuretics
- Non-steroidal anti-inflammatory drugs (NSAIDs)
Dental Materials
- Amalgam fillings
- Metal restorations
Lichenoid lesions may develop as a result of contact reaction.
Psychological Factors
Stress and anxiety:
Can play an important role in the onset of the disease
In flare-ups.
Systemic Diseases
- Diabetes
- Thyroid diseases
- Autoimmune diseases
May be associated with.
OLP is also sometimes seen in diseases
for example:
- Hepatitis B
- Hepatitis C
- Human papillomavirus (HPV) infection
- Primary biliary cirrhosis
However, more scientific research is needed to understand the link between these diseases and OLP (source: Oral Lichen Planus: Symptoms, Causes & Treatment).
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| the erosive (ulcerative) form of Oral Lichen Planus |
How Many Types of Oral Lichen Planus Are There?
OLP presents clinically in different forms. This classification is important both for prognosis and treatment approach.
Reticular Type
The most common and mildest form. White, lace-like lines (Wickham lines) are seen on the inside of the cheeks, tongue, or gums. It is usually painless (asymptomatic).
Papular Type
Small white papules
Can transform into the reticular form
Plaque Type
These are white, flat or slightly raised lesions that appear as patches. Homogeneous white plaques. Can be confused with leukoplakia
Atrophic (Erythematous) Type
Characterized by widespread redness and burning sensation in the oral mucosa. Often seen together with the erosive type. Red, thinned mucosa. Burning sensation is prominent
Erosive (Ulcerative) Type
Presents painful, red, and ulcerated areas. Can cause severe pain when eating or drinking. This is the most symptomatic form. It has a higher risk of premalignant transformation.
Bullous Type
This is a rarer and more severe form in which fluid-filled blisters (bullae) form in the mouth. The blisters can burst and transform into an erosive form. It is rare.
How is the OLP Diagnosis Made?
Oral lichen planus can usually be diagnosed based on clinical findings, but histopathological confirmation is important for a definitive diagnosis.
Clinical Examination
Distribution of lesions (bilateral/symmetrical)
Appearance (reticular, erosive, etc.)
.jpg) |
| the erosive (ulcerative) form of Oral Lichen Planus |
Symptoms
Biopsy (Gold Standard)
Histopathological features:
- Band-like lymphocyte infiltration
- Basal cell degeneration
- Saw-tooth rete ridge structure
Direct Immunofluorescence (DIF)
- Fibrinogen deposition in the basal membrane
- Helpful in differential diagnosis
Are Blood Tests Helpful in Diagnosis?
Blood tests do not directly diagnose OLP, but they are important for investigating underlying causes.
Tests that may be requested:
- Complete blood count
- Fasting blood glucose (for diabetes)
- Thyroid function tests
- Vitamin B12, folate
- Iron level
- Hepatitis C serology
These tests are performed to:
- Identify comorbidities
- Guide the treatment plan
Are Imaging Methods Necessary?
Routine imaging methods have no place in the diagnosis of oral lichen planus.
However, in some cases:
- Deep ulcerations
- Suspected malignant transformation
- further evaluation may be necessary.
Methods that can be used:
- MRI (soft tissue evaluation)
- Ultrasound (lymph node evaluation)
Differential Diagnosis
Leukoplakia
Leukoplakia presents clinically as indelible white plaques and may resemble the reticular or plaque type of OLP. However, unlike OLP, it is usually unilateral, does not show symmetrical distribution, and does not have Wickham striae. Leukoplakia may be more homogeneous, sharply demarcated, and have a flat surface. One of the most important differences is that the risk of dysplasia and malignant transformation is more pronounced in leukoplakia. Therefore, especially non-homogeneous, nodular, or erythroleukoplakia areas require biopsy.
Erythroplakia
Erythroplakia is observed as bright red, velvety, and well-demarcated areas on the oral mucosa. It can be confused with the atrophic or erosive form of OLP; however, white reticular lines are usually absent in erythroplakia. The lesions are more uniformly red in color and often unifocal. The most critical difference is that erythroplakia has a much higher probability of containing a high degree of dysplasia or carcinoma. Therefore, biopsy should not be delayed when erythroplakia is detected.
Oral Candidiasis
Oral candidiasis, especially with its pseudomembranous type of white plaques, can resemble OLP. However, in candidiasis, the white plaques usually reveal an erythematous surface underneath when wiped with gauze, whereas in OLP, the lesions are not wiped away. Candidiasis is often associated with immunosuppression, antibiotic use, or diabetes and has a more acute onset. Furthermore, a rapid response to antifungal treatment is a distinguishing feature from OLP.
Pemphigus Vulgaris
Pemphigus vulgaris presents with painful erosions and blisters in the mouth and can be particularly confused with erosive OLP. However, in pemphigus, the blisters are more prominent and easily rupture, and the Nikolsky sign is positive (epithelial separation on light pressure). Histopathologically, intraepithelial separation is seen, while in OLP there is subepithelial band-like inflammation. Direct immunofluorescence examination shows intercellular IgG deposition in pemphigus, which is an important differentiating factor.
Mucosal Pemphigoid
Mucosal pemphigoid, especially in the gingiva, may resemble OLP with its desquamative gingivitis picture. However, subepithelial bulla formation is prominent in pemphigoid, and lesions often heal with scarring. Scarring usually does not occur in OLP. In addition, pemphigoid can affect other mucous membranes such as the eyes. The presence of linear IgG and C3 deposition in the basement membrane on direct immunofluorescence examination is important in differential diagnosis.
Lupus Erythematosus
Lupus erythematosus can cause white streaks and erythematous areas similar to OLP, especially in the oral mucosa. However, lupus lesions are generally more irregularly bordered and are often accompanied by systemic symptoms (skin rash, photosensitivity, joint pain). Histopathological and immunofluorescence findings are different; In lupus, granular immune complex deposition is observed in the basement membrane. Additionally, positive results for ANA and anti-dsDNA in serological tests support the diagnosis.
Risk of Malignant Transformation
Oral lichen planus has a low but significant risk of malignant transformation.
Risk factors:
- Erosive type
- Smoking and alcohol use
- Chronic irritation
- Presence of HPV
Transformation usually takes the form of:
➡️ Squamous cell carcinoma
Therefore:
Regular follow-up (6-12 months)
Biopsy of suspicious areas
is important.
Treatment Approach For Oral Lichen Planus
Topical Treatment
Topical treatment is the first step in the management of Oral Lichen Planus and is preferred, especially in localized, symptomatic lesions. Topical corticosteroids (e.g., clobetasol propionate, fluticasone, triamcinolone) suppress inflammation, reducing pain and burning sensations. They can be applied in gel, ointment, or gargle form, and direct application to the lesion increases effectiveness. Calcineurin inhibitors (tacrolimus, pimecrolimus) provide an alternative in cases resistant to steroids or requiring long-term use. These agents act by inhibiting T cell activation, but require careful monitoring due to local immunosuppression with long-term use.
Systemic Treatment
Systemic treatment is considered in cases that are widespread, severe, or unresponsive to topical treatment. In these patients, systemic corticosteroids can be used for a short period to rapidly control inflammation. However, long-term use is limited due to side effects. In resistant cases, immunosuppressive agents (e.g., azathioprine, cyclosporine, methotrexate) or, in some cases, retinoids may be preferred. When planning systemic treatment, the patient's comorbidities and drug side effects must be considered, and a multidisciplinary approach should be adopted.
Supportive Treatments
Supportive treatments are critical for improving symptom control and preventing disease flare-ups. Maintaining oral hygiene reduces the risk of secondary infection and supports lesion healing. Patients should be advised to avoid spicy, acidic, and traumatic foods. Quitting smoking and alcohol use is important. Stress management can also be effective in reducing disease flare-ups, as psychological stress is a significant trigger in OLP. If necessary, psychological support or lifestyle modifications should be included in the treatment.
Lifestyle Changes
Some simple adjustments to daily habits can help reduce the frequency and severity of flare-ups in oral lichen planus. While triggers vary from person to person, there are generally some recommendations that benefit many patients.
First, it is important to avoid acidic, hard-textured, very salty, or spicy foods that can irritate the oral mucosa. Similarly, alcohol consumption and tobacco use can worsen lesions by increasing mucosal irritation, so they should be completely stopped if possible.
While paying attention to oral hygiene, it is necessary to minimize trauma. For this purpose, it is recommended to use a manual toothbrush with soft bristles or an electric toothbrush in low speed/sensitivity mode. Also, non-flavored, gentle toothpastes and dental floss should be preferred; products containing mint, cinnamon, and sodium lauryl sulfate, in particular, may cause irritation in some patients.
Since psychological stress can play a significant role in disease flare-ups, practicing regular stress management techniques (e.g., breathing exercises, meditation, or physical activity) can be beneficial.
Finally, some medications can trigger lichenoid reactions. Therefore, it is important to consult a doctor about medications that may be associated with flare-ups and to consider alternative treatment options if necessary.
Complications of Oral Lichen Planus
Oral lichen planus is a chronic disease that can lead to various complications over time. One of the most common problems is chronic pain and burning sensation. Especially in erosive and atrophic forms, patients may experience significant discomfort while eating, leading to impaired dietary habits and a significant decrease in quality of life. Intolerance to spicy and acidic foods may restrict patients' diets.
Another important complication is secondary infections. Disruption of the integrity of the oral mucosa creates a favorable environment for the development of oral candidiasis. This risk is further increased in patients receiving topical or systemic corticosteroid treatment. When candidiasis develops, existing symptoms may worsen and the response to treatment may be delayed.
As a result of long-term inflammation and epithelial damage, scarring and mucosal atrophy may develop in some patients. Especially in cases of gingival involvement, desquamative gingivitis can progress, causing bleeding and sensitivity during brushing. This situation can lead to poor oral hygiene and indirectly increase the risk of periodontal disease.
The most important and clinically significant complication is the risk of malignant transformation. Oral lichen planus is associated with the development of oral squamous cell carcinoma, albeit at low rates. This risk is higher, especially in erosive and atrophic types, and in individuals who smoke and consume alcohol. Therefore, regular follow-up of patients and prompt biopsy of suspicious lesions are of great importance.
When oral lichen planus is severe, especially in the erosive form, it can cause significant pain during eating. This can lead to patients skipping meals, and consequently, weight loss over time. Furthermore, the disruption of the integrity of the oral mucosa increases susceptibility to both fungal (especially candidiasis) and bacterial infections.
Current data suggest that a small percentage of individuals with oral lichen planus may develop oral cancer. While this risk is generally low, it is considered higher in the erosive type. However, predicting which patients will develop malignant transformation is still unclear, and further scientific studies are needed in this area.
Therefore, regular medical check-ups are of great importance. During clinical follow-up, changes in the oral mucosa that may be precancerous are carefully evaluated. Since the success rate of treatment is quite high in lesions detected in the early stages, periodic examinations play a critical role in the management of the disease.
Frequently Asked Questions About Oral Lichen Planus
What should I expect if I have lichen planus in my mouth?
Oral lichen planus is generally a chronic disease, and it may not always disappear completely. However, this does not mean you have to live with constantly severe symptoms. The disease often follows periods of exacerbation and remission. While symptoms may completely disappear during remission periods, burning, pain, or tenderness may increase during exacerbations. In some patients, the lesions remain painless and stable, while others may experience symptoms requiring more intensive treatment.
Are the symptoms the same for everyone?
No, symptoms vary from person to person. Some individuals may only have lesions that are not noticeable, appearing as white lines; others may experience severe pain, tenderness, and difficulty eating, especially in the erosive form. Therefore, the treatment approach is planned according to the severity of the patient's symptoms.
What can I do to feel better?
Small changes in daily life are quite effective in alleviating symptoms. Maintaining good oral hygiene, avoiding irritating foods, and not neglecting regular check-ups are important. Stress management techniques (breathing exercises, meditation, therapy support) can also be beneficial, as stress is a significant trigger for disease flare-ups. For those experiencing long-term discomfort, psychological support can also improve quality of life.
Does oral lichen planus cause cancer?
Oral lichen planus carries a low risk of malignant transformation in some cases. This risk is slightly higher, especially in erosive and atrophic types. However, not every patient develops cancer. Regular check-ups with a doctor and biopsies of suspicious lesions allow for early detection of potential changes.
Is oral lichen planus contagious?
No, oral lichen planus is not contagious. It is not transmitted from person to person through viruses, bacteria, or fungi. Therefore, transmission through social contact or shared items is not possible.
What diseases can be confused with oral lichen planus?
OLP may have a similar appearance to some oral lesions. Oral candidiasis can be confused with conditions such as leukoplakia and erythroplakia. These diseases have different causes and treatments. A clinical examination, biopsy if necessary, and additional tests are performed to make a definitive diagnosis.
When should I see a doctor?
If you have persistent white or red lesions in your mouth, pain, burning, or ulcers, you should definitely consult a specialist. It is especially important to have the lesions evaluated promptly if any changes in shape, color, or size are noticed. Early diagnosis plays a critical role in both symptom control and the prevention of possible complications.
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Murat Enoz, MD, Otorhinolaryngology, Head and Neck Surgeon
Private Office:
Address: İncirli Cad. No:41, Kat:4 (Dilek Patisserie Building), Postal code: 34147, Bakırköy - İstanbul
Appointment Phone: +90 212 561 00 52
Appointment Phone: +90 212 561 00 52
Fax: +90 212 542 74 47
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