π£ Lichen Planus β Types, Causes, Symptoms, Diagnosis & Treatment
A complete guide to lichen planus: understanding the types (cutaneous, oral, genital, scalp, nail), causes, symptoms, diagnosis, and effective treatment options for this chronic inflammatory condition.
Lichen planus is a chronic inflammatory condition affecting skin, mucous membranes, hair, and nails, caused by an overactive immune system attacking skin cells. This comprehensive guide covers types (cutaneous, oral, genital, scalp, nail, hypertrophic, bullous, esophageal), causes (autoimmune, hepatitis C, medications, stress), symptoms (the "6 Ps": purple, polygonal, planar, pruritic, papules, plaques; Wickham striae; Koebner phenomenon), diagnosis (biopsy, immunofluorescence), and treatment options (topical steroids, systemic steroids, immunosuppressants, phototherapy, calcineurin inhibitors). Includes prevention strategies and a "Do's & Don'ts" checklist.
π Table of Contents
π€ What is Lichen Planus?
Lichen planus is a common, chronic inflammatory condition that affects the skin, mucous membranes, hair, and nails. It occurs when the body's immune system mistakenly attacks skin and mucous membrane cells, causing inflammation and irritation.
Key characteristics of lichen planus:
- Not contagious β cannot be spread from person to person
- Chronic β can last for months to years
- Self-limiting β often resolves on its own in 1-2 years
- Recurrent β can recur in some people
- Common in adults β most develop it between ages 30-60
π Types of Lichen Planus
Lichen planus can affect different parts of the body, each with distinct characteristics:
π£ Cutaneous (Skin) LP
- Most common form
- Itchy, shiny, flat-topped violaceous (purple) papules
- Wickham striae β fine, lacy white lines
- Koebner phenomenon β new lesions at injury sites
- Location: flexor wrists, dorsal hands, lower back, ankles
π£ Oral Lichen Planus
- Affects the mouth, especially buccal mucosa
- Reticular type: asymptomatic white, lacy patches (most common)
- Erosive type: painful ulcers, burning pain
- Atrophic type: red, painful areas
- Plaque-like: resembles leukoplakia
π£ Genital Lichen Planus
- Men: annular lesions on glans penis
- Women: bright red, painful erosions on vulva/vagina
- Can cause scarring and strictures
- Vulvovaginal-gingival syndrome: affects vulva, vagina, and gums
π£ Lichen Planopilaris (Scalp)
- Affects the scalp and hair follicles
- Red follicular papules
- Progressive scarring alopecia (permanent hair loss)
- Early treatment is essential to prevent hair loss
π£ Nail Lichen Planus
- Affects up to 10% of LP patients
- Thinning and ridging of nails
- Nail plate splitting
- Dorsal pterygium β scarring of proximal nail fold
- Complete nail loss in severe cases
π£ Hypertrophic LP
- Thicker, more severe skin subtype
- Scaly, hyperkeratotic plaques
- Common on shins and ankles
- Intensely pruritic
π£ Bullous Lichen Planus
- Rare subtype with blisters
- Vesicles or bullae on top of lesions
- May mimic bullous pemphigoid
π£ Esophageal Lichen Planus
- Rare but serious
- Causes dysphagia (difficulty swallowing)
- Can lead to strictures
- Risk of squamous cell carcinoma
π Causes & Risk Factors
The exact cause of lichen planus is unknown, but it is believed to involve an altered immune response where T-cells attack basal keratinocytes, leading to apoptosis (cell death) of skin cells.
𧬠Root Causes
Autoimmune
Immune system attacks skin and mouth cells by mistake
Hepatitis C
Strong association; screening recommended for all patients
Medications
Blood pressure, diabetes, heart meds, antimalarials
Vaccinations
Hepatitis B, influenza, COVID-19 may trigger LP
Dental Materials
Reactions to metal fillings
Stress
Psychosocial stress may trigger or worsen LP
β οΈ Risk Factors
Age
Most common in adults aged 30-60
Sex
Equal in cutaneous LP; oral LP is 2x more common in women
Genetics
HLA-DQB1*02:01 gene associated with vulvovaginal-gingival syndrome
π¨ Symptoms of Lichen Planus
π΄ The "6 Ps" of Cutaneous Lichen Planus
Purple
Violaceous color β the hallmark sign
Polygonal
Angular, geometric shape
Planar
Flat-topped papules and plaques
Pruritic
Often severely itchy
Papules
Small, raised bumps
Plaques
Larger, confluent lesions
π Additional Skin Features
Wickham Striae
Fine, lacy, white lines on the surface of lesions β a diagnostic hallmark
Koebner Phenomenon
New lesions appear at sites of minor skin injury, scratching, or friction
Common Locations
Flexor wrists, dorsal hands, lower back, ankles, shins
π Oral Lichen Planus Symptoms
- Reticular type: Asymptomatic white, lacy patches on buccal mucosa (most common)
- Erosive type: Painful, shallow ulcers; burning pain worsened by hot/spicy foods
- Atrophic type: Red, painful areas
- Plaque-like type: Resembles leukoplakia
π Nail Symptoms
- Longitudinal ridging and thinning
- Nail plate splitting
- Dorsal pterygium β scarring of proximal nail fold onto nail bed
- Complete nail loss in severe cases
π§β𦲠Scalp Symptoms (Lichen Planopilaris)
- Redness and irritation
- Tiny bumps around hair follicles
- Progressive scarring alopecia (permanent hair loss)
- New rash or sores that don't improve
- Severe itching or pain
- Oral or genital lesions
- Hair loss on the scalp
- Nail changes (thinning, ridges, splitting)
- Difficulty swallowing
π©Ί Diagnosis
Diagnosing lichen planus is often based on the characteristic appearance of lesions, but confirmation may require additional tests:
Clinical Examination
Violaceous, flat-topped papules with Wickham striae
Skin Biopsy
Confirm diagnosis; examine under microscope
Direct Immunofluorescence
Distinguish LP from other lichenoid dermatoses
Blood Tests
Rule out hepatitis C and other causes
Dermoscopy
Improve visualization of Wickham striae
π Treatment Options
Lichen planus treatment focuses on managing symptoms, reducing inflammation, and addressing underlying causes:
Topical Steroids
High-potency steroids (clobetasol, fluocinonide, betamethasone) β first-line for most localized cases. Lower-potency steroids (hydrocortisone, desonide) for face, groin, and axillae. Intralesional steroids (triamcinolone) for hypertrophic plaques, scalp lesions, and resistant cases.
Calcineurin Inhibitors
Tacrolimus and pimecrolimus β topical alternatives for oral and genital LP, especially where steroids are less effective or not preferred.
Systemic Treatments
Oral steroids (prednisone) for severe or generalized cases. Oral retinoids (acitretin) for recalcitrant cases. Immunosuppressants (methotrexate, cyclosporine, mycophenolate mofetil) for severe, refractory cases. Hydroxychloroquine as an alternative option. JAK inhibitors are emerging treatments.
Phototherapy
Narrowband UVB (NBUVB) or PUVA for generalized cutaneous LP.
Specific Site Management
Oral LP: Topical steroids, calcineurin inhibitors; avoid spicy/acidic foods. Genital LP: Topical steroids; specialist consult recommended. Scalp LP: Early treatment to prevent permanent hair loss; intralesional steroids. Drug-induced LP: Stop offending medication; takes weeks to months to resolve.
π¨ Complications
Oral Cancer Risk
- Oral lichen planus may be an early warning sign
- Erosive form can become cancerous if long-standing
- Regular dental check-ups are essential
Genital Scarring
- Can cause pain and strictures
- May lead to sexual dysfunction
- Specialist care is recommended
Esophageal Strictures
- Rare but serious complication
- Causes dysphagia (difficulty swallowing)
- Requires endoscopic dilation
Permanent Hair Loss
- From untreated lichen planopilaris
- Scarring alopecia is irreversible
- Early treatment is essential
Hyperpigmentation
- Dark patches may remain after lesions fade
- Can persist for months to years
- May resolve with topical treatments
β Do's and Don'ts
β Do's
- See a dermatologist for proper diagnosis
- Get screened for hepatitis C
- Use prescribed topical steroids as directed
- Visit your dentist twice yearly for oral exams
- Manage stress with relaxation techniques
- Protect your skin from injury (prevents Koebner phenomenon)
- Keep a symptom diary to identify triggers
- Follow your treatment plan consistently
β Don'ts
- Don't ignore new skin or mouth lesions
- Don't self-diagnose β can mimic other conditions
- Don't overuse steroids (can cause skin thinning)
- Don't smoke β may worsen oral LP
- Don't scratch β can cause Koebner phenomenon
- Don't stop prescribed medications without consulting a doctor
- Avoid spicy/acidic foods if you have oral LP
- Don't ignore signs of infection or rapid worsening
π¨ββοΈ Which Doctor to See
π― Conclusion
Lichen planus is a common, chronic, and manageable inflammatory condition that affects the skin, mucous membranes, hair, and nails. While there is no cure, with proper diagnosis, treatment, and management, most people can control their symptoms and prevent complications.
πͺ Remember: If you have skin, mouth, or genital lesions that concern you β see a dermatologist for proper diagnosis and treatment. With the right care, you can manage lichen planus effectively!
β οΈ Disclaimer: This information is for educational purposes only and should not replace professional medical advice. Always consult a healthcare provider for proper diagnosis and treatment.