Oral Lichen Planus: Symptoms, Causes, and UK Treatment Options

Oral lichen planus is an ongoing (chronic) inflammatory condition that affects the mucous membranes inside your mouth. Unlike a standard mouth ulcer or a fungal infection like thrush, lichen planus is an autoimmune-mediated response where the body's immune system attacks the cells of the oral mucosa for reasons that are not yet fully understood.

In the UK, it is estimated to affect around 1% to 2% of the population, most commonly occurring in adults over the age of 40. It is more frequently diagnosed in women than in men. It is important to note that oral lichen planus is not contagious; you cannot catch it from another person, nor can you pass it on through kissing or sharing utensils.

Common Appearances

The condition can manifest in several ways. The most common form is 'reticular' lichen planus, which presents as a white, lace-like pattern on the inside of the cheeks. Other forms include 'erosive' lichen planus, which causes painful redness and ulceration, and 'atrophic' lichen planus, which can make the gums appear bright red and shiny.

Symptoms of oral lichen planus can range from being entirely painless to causing significant discomfort that interferes with eating and drinking. British patients often describe the following signs:

• White patches: Lacy, thread-like white lines (known as Wickham striae) on the cheeks, tongue, or gums.
• Redness and swelling: Inflamed, tender areas that may feel raw.
• Open sores: Ulcers that can be painful and slow to heal, particularly in the erosive form.
• Burning sensation: Discomfort when eating spicy, acidic, or salty foods.
• Bleeding gums: Gums that bleed easily during brushing, often referred to as desquamative gingivitis.

Because these symptoms can mimic other conditions, such as leukoplakia or oral candidiasis, an accurate diagnosis from a healthcare professional is essential.

The exact cause of oral lichen planus remains a subject of clinical research. However, it is widely accepted as an autoimmune process where T-cells (a type of white blood cell) attack the skin cells in the mouth. While there is no single 'cure', several factors are known to trigger or worsen flares in UK patients:

• Stress: High levels of emotional stress are frequently reported as a trigger for new outbreaks.
• Mouth injury: Trauma from sharp teeth, poorly fitting dentures, or dental procedures.
• Allergies: Sensitivities to dental materials, such as amalgam fillings, though this is less common.
• Medications: Certain drugs for high blood pressure (beta-blockers) or anti-inflammatory medications (NSAIDs) can cause 'lichenoid' reactions.
• Medical conditions: There is a documented link between lichen planus and Hepatitis C, although this is rarer in the UK than in other parts of the world.

Treatment for oral lichen planus follows NICE (National Institute for Health and Care Excellence) clinical knowledge summaries, focusing on symptom control. If the condition is not causing pain, treatment may not be necessary, though regular monitoring is required.

Medical Treatments

If you are experiencing discomfort, a GP or dentist may recommend:

• Topical Corticosteroids: These are the mainstay of treatment. They come in the form of gels, ointments, or mouthwashes (such as betamethasone soluble tablets dissolved in water) to reduce inflammation.
• Antiseptic Mouthwashes: Chlorhexidine mouthwash may be used to prevent secondary infections and keep the mouth clean.
• Pain Relief: Benzydamine (Difflam) spray or mouthwash can provide temporary numbing and cooling to sore areas.
• Immunosuppressants: In severe, resistant cases, a specialist may prescribe stronger medications like tacrolimus or systemic steroids.

If you notice new white patches, persistent ulcers, or sore areas in your mouth that do not clear up within two weeks, it is time to speak to a GP. Using an online doctor service can be a convenient first step for British patients to receive an initial assessment.

During a video consultation, you can describe your symptoms and, where possible, show the areas of concern via a high-quality camera. An online GP can help differentiate between common issues like aphthous ulcers (canker sores) and chronic conditions like lichen planus. They can provide advice on immediate symptom relief, prescribe initial topical treatments, and advise whether you need a referral to a secondary care specialist, such as an oral surgeon or a dermatologist, for a biopsy.

Regular follow-up is vital. While the risk is low (around 1%), oral lichen planus is considered a 'potentially malignant' condition. This means that a small number of cases can develop into oral cancer over many years. A GP can help you establish a monitoring plan to ensure any changes are caught early.

Managing oral lichen planus often involves making small changes to your daily routine to prevent irritation of the delicate mouth lining. NHS guidance suggests:

• Maintain excellent oral hygiene: Use a soft-bristled toothbrush and a mild, SLS-free (sodium lauryl sulfate) toothpaste to avoid stinging.
• Dietary adjustments: Avoid very spicy, acidic (citrus/vinegar), or crunchy foods (like crusty bread or crisps) during a flare-up.
• Quit smoking: Smoking irritates the mouth and increases the risk of complications.
• Reduce alcohol: High-strength spirits can cause significant stinging in eroded areas.
• Regular dental check-ups: Ensure your dentist is aware of your diagnosis so they can check the health of your gums and teeth regularly.