Lichen Planus: Symptoms, Causes, and Treatment in the UK

Lichen planus is a relatively common skin condition characterised by an itchy rash of small, purple-red, flat-topped bumps. While the name may sound complex, it essentially describes a specific pattern of inflammation in the skin. In the UK, it affects approximately 1% of the population, most commonly occurring in adults over the age of 40.

Importantly, lichen planus is not contagious. You cannot catch it from someone else, and you cannot pass it on to others. It is not caused by poor hygiene or an allergy. Instead, it is believed to be an autoimmune-mediated condition, where the body's immune system mistakenly attacks the cells of the skin or mucous membranes.

While the skin is the most frequent site of involvement, the condition can also affect the mouth (oral lichen planus), the scalp, the nails, and the genitals. Understanding the triggers and treatments available is the first step toward managing the discomfort associated with this condition.

Skin Symptoms

The skin rash typically has several distinct characteristics that help UK doctors identify it. These include:

• Purple or reddish bumps: These are often firm and have a flat top.
• Wickham’s Striae: If you look closely (sometimes with a magnifying glass), you may see fine, white, lace-like lines across the surface of the bumps.
• Location: The rash most frequently appears on the inner wrists, the shins, and the small of the back.
• Intense Itch: For many patients, the itch is the most distressing symptom and can interfere with sleep and daily activities.
• Koebner Phenomenon: New bumps may appear along the line of a scratch or skin injury.

Mouth and Other Areas

In the mouth, lichen planus often appears as white streaks on the inside of the cheeks or the tongue. Unlike the skin rash, oral lichen planus may be painless, though it can sometimes cause sore red patches or ulcers that make eating spicy or acidic foods uncomfortable. When it affects the nails, it can cause thinning, ridges, or in rare cases, nail loss.

The exact cause of lichen planus remains unknown, though it is widely classified as an autoimmune disorder. This means the T-cells (a type of white blood cell) begin to attack a protein in the skin for reasons that are not yet fully understood by medical science.

There are certain factors that have been linked to the development or flare-up of the condition, including:

• Certain Medications: Some medicines for high blood pressure, heart disease, or arthritis can trigger a 'lichenoid' reaction.
• Hepatitis C: There is a statistical link between lichen planus and the Hepatitis C virus, though this is less common in the UK than in other parts of the world.
• Stress: While not a primary cause, many patients report that emotional stress can worsen their symptoms.
• Metallic Fillings: In very rare cases of oral lichen planus, an allergy to mercury in dental fillings may be a contributing factor.

If you suspect you have lichen planus, you should consult a healthcare professional. Most UK GPs can diagnose the condition by looking at the rash and asking about your symptoms. The presence of Wickham's striae (the white lines) is often a definitive sign.

In cases where the diagnosis is unclear, a GP may refer you to a dermatologist or suggest a skin biopsy. This involves numbing a small area of skin and removing a tiny sample to be examined under a microscope. If the mouth is affected, you may also be advised to see a dentist or oral specialist if the patches are painful or ulcerated.

According to NICE (National Institute for Health and Care Excellence) guidance, treatment for lichen planus is focused on symptom relief, as the condition often resolves spontaneously over time (usually within 18 months).

Prescription Treatments

• Topical Corticosteroids: High-potency steroid creams or ointments are the mainstay of treatment. These help reduce inflammation and significantly calm the itching.
• Antihistamines: While they do not treat the rash itself, sedative antihistamines taken at night can help patients sleep if the itching is severe.
• Oral Steroids: For very widespread or severe cases, a short course of prednisolone tablets may be prescribed by a specialist.

Self-Care Tips

To manage the condition at home, UK patients are advised to:

• Avoid washing with harsh soaps; use emollient soap substitutes instead.
• Avoid scratching, as this can lead to skin damage and secondary infections.
• Keep the skin well-hydrated with unperfumed moisturisers.
• For oral lichen planus, avoid spicy, acidic, or salty foods that could irritate the mouth.

Navigating skin conditions can be frustrating, especially when waiting for a traditional GP appointment. You may choose to speak to a UK online doctor if you have developed a new, itchy rash and need an initial assessment or guidance on whether your symptoms match the profile of lichen planus.

An online GP consultation provides a convenient way to discuss your symptoms, share clear photographs of the affected areas, and receive professional advice from the comfort of home. If the doctor confirms a diagnosis of mild-to-moderate lichen planus, they can provide a private prescription for high-potency steroid creams to help manage the itch. Furthermore, if your symptoms appear atypical or severe, an online doctor can advise you on the necessary next steps or secondary care referrals.