Lichen Planopilaris: Causes, Symptoms, Diagnosis & Treatment

Lichen Planopilaris (LPP) is a rare inflammatory condition that causes permanent hair loss. It is a type of cicatricial (scarring) alopecia, meaning that inflammation targets and destroys hair follicles, replacing them with scar tissue. This scarring prevents future hair growth in the affected areas. While LPP can be distressing due to its irreversible nature, understanding its mechanisms, symptoms, and available management strategies is crucial for early intervention and slowing its progression.

What is Lichen Planopilaris (LPP)?

Lichen Planopilaris is a chronic inflammatory disorder that primarily affects the hair follicles on the scalp. It is considered an autoimmune condition — the body’s immune system mistakenly attacks its own hair follicles. The inflammation typically occurs around the upper part of the hair follicle, leading to its destruction and subsequent scarring, resulting in patchy, permanent hair loss often accompanied by itching, burning, and scalp tenderness.

LPP is part of a broader group of conditions known as lichen planus, which can affect the skin, nails, and mucous membranes. When it specifically targets hair follicles, it is termed lichen planopilaris. While it can occur at any age, it most commonly affects middle-aged women, though men can also be affected. The condition is not contagious.

Causes and Pathogenesis of Lichen Planopilaris

The exact cause of LPP remains unknown, but it is understood to be an autoimmune process. Specific immune cells — particularly T-lymphocytes — mistakenly target and attack keratinocytes in the hair follicle’s outer root sheath. This triggers an inflammatory cascade that ultimately destroys the follicular stem cells and sebaceous glands, culminating in irreversible scarring.

Autoimmune Factors

The immune system, for reasons not yet fully understood, identifies components of the hair follicle as foreign and mounts an attack. This is similar in concept to other autoimmune conditions that cause hair loss, such as alopecia areata, though the mechanism and outcome (scarring) differ significantly.

Genetic Predisposition

Certain human leukocyte antigen (HLA) types have been associated with an increased risk of developing lichen planus, suggesting a genetic component that influences immune system reactivity — though LPP is not strongly hereditary.

Environmental Triggers

Environmental factors are suspected to play a role in triggering LPP in genetically predisposed individuals — including certain medications, viral infections, stress, or exposure to specific allergens. However, concrete evidence for specific triggers is still being researched.

Role of Inflammation

Inflammation is the hallmark of LPP. A lymphocytic inflammatory infiltrate surrounds the hair follicle, particularly at the isthmus and infundibulum, leading to perifollicular fibrosis and eventual replacement of the hair follicle with dense scar tissue.

Symptoms and Clinical Presentation

The symptoms of Lichen Planopilaris can vary in severity and presentation, often evolving over time. Recognizing these signs early is crucial for timely diagnosis and management.

Hair Loss Patterns

• Patchy Hair Loss: LPP typically presents as irregular patches of hair loss, often on the vertex and parietal regions of the scalp.
• Follicular Ostia Loss: Within affected patches, the follicular openings are often absent, indicating follicle destruction.
• Progressive Nature: The hair loss is progressive and permanent — unlike hair thinning or bald spots from non-scarring alopecias, hair will not regrow spontaneously in affected areas.

Scalp Symptoms

• Itching (Pruritus): One of the most common and distressing symptoms, ranging from mild to severe.
• Burning Sensation: Many individuals report a burning or stinging sensation, particularly in areas of active inflammation.
• Tenderness or Pain: The scalp can feel tender to the touch, and some may experience pain.
• Redness (Erythema): Inflammation around hair follicles causes redness, especially at the periphery of expanding patches.
• Perifollicular Erythema and Scaling: A distinctive sign — redness and fine scaling around the base of individual hair follicles, often described as a ‘perifollicular collar.’

Other Manifestations

• Frontal Fibrosing Alopecia (FFA): A variant of LPP characterized by progressive hair loss along the frontal hairline and eyebrows.
• Graham-Little Syndrome: A rare triad involving LPP of the scalp, non-scarring alopecia of the armpits and groin, and follicular keratosis on the body.
• Lichen Planus Elsewhere: Individuals with LPP may also develop lichen planus on the skin (purplish, itchy bumps), nails (nail dystrophy), or mucous membranes (white lacy patterns in the mouth).

Diagnosis of Lichen Planopilaris

Early and accurate diagnosis is critical for initiating treatment and minimizing irreversible hair loss. Diagnosis requires a comprehensive approach combining clinical examination with specific diagnostic tests.

Clinical Examination

A trichologist or dermatologist will thoroughly examine the scalp, looking for characteristic signs such as patchy hair loss, perifollicular erythema, and scaling, while assessing the extent of active inflammation and scarring.

Trichoscopy

Trichoscopy (dermoscopic examination of the scalp) can reveal specific patterns indicative of LPP — including perifollicular erythema, white dots representing follicular scarring, and the absence of follicular openings. These findings help differentiate LPP from other forms of hair loss.

Scalp Biopsy

The definitive diagnosis of LPP is typically made through a scalp biopsy. Histopathological features characteristic of LPP include a lichenoid inflammatory infiltrate at the periphery of the hair follicle, vacuolar degeneration of basal keratinocytes, and perifollicular fibrosis — confirming the diagnosis and ruling out other scarring alopecias.

Differential Diagnosis

LPP must be differentiated from other scarring alopecias, including:

• Discoid Lupus Erythematosus (DLE): Another autoimmune scarring alopecia with distinct histopathological features.
• Folliculitis Decalvans: A neutrophilic scarring alopecia characterized by pustules and crusting.
• Central Centrifugal Cicatricial Alopecia (CCCA): Primarily affecting individuals of African descent, causing progressive scarring alopecia on the crown.

Treatment Options for Lichen Planopilaris

The primary goals of LPP treatment are to halt the progression of hair loss, reduce inflammation, alleviate symptoms, and prevent further scarring. While there is no cure, various treatments can effectively manage the condition and preserve existing hair follicles.

Topical Treatments

• Topical Corticosteroids: High-potency options (e.g., clobetasol propionate) are often the first line of treatment, helping reduce inflammation and itching.
• Topical Calcineurin Inhibitors: Tacrolimus and pimecrolimus creams serve as alternatives or adjunctive therapies for long-term management, avoiding side effects of prolonged corticosteroid use.

Intralesional Injections

Intralesional corticosteroid injections (e.g., triamcinolone acetonide) directly into inflamed areas can be very effective in suppressing localized inflammation and preventing further hair loss in active patches.

Oral Medications

• Oral Corticosteroids: Short courses of prednisone can rapidly control severe inflammation, often as a bridge to other long-term therapies.
• Hydroxychloroquine: An antimalarial drug with anti-inflammatory properties, often used as a first-line systemic treatment — particularly effective at reducing itching and slowing disease progression.
• Doxycycline: An antibiotic with anti-inflammatory effects that can be beneficial in some cases.
• Immunosuppressants: Cyclosporine, methotrexate, or mycophenolate mofetil may be used in severe or rapidly progressing cases that do not respond to other treatments.
• Pioglitazone: An antidiabetic drug that has shown promise in some studies for LPP due to its anti-inflammatory effects.

Emerging Therapies

• JAK Inhibitors: Oral medications such as tofacitinib and baricitinib are being investigated for their potential to modulate the immune response in LPP.
• Platelet-Rich Plasma (PRP): PRP’s anti-inflammatory and growth factor properties are being explored for potential benefits in early LPP, though evidence is still limited.

Hair Transplantation

Hair transplantation (FUE or FUT) is generally not recommended during active LPP as the ongoing inflammatory process is likely to affect transplanted follicles. However, once the disease has been in remission for at least 1–2 years with no signs of active inflammation, transplantation may be considered to restore hair in scarred areas.

Lifestyle and Supportive Care

• Gentle Hair Care: Avoiding harsh chemical treatments, excessive heat, and tight hairstyles minimizes scalp irritation.
• Stress Management: Stress can exacerbate inflammatory conditions — incorporating stress-reduction techniques may be beneficial.
• Nutritional Support: Maintaining a balanced diet and addressing nutritional deficiencies supports overall scalp health, though their specific impact on LPP is not established.

Prognosis and Living with Lichen Planopilaris

Lichen Planopilaris is a chronic condition requiring ongoing management. While hair loss in affected areas is permanent, early diagnosis and consistent treatment can significantly slow progression and minimize further damage. Many individuals can achieve disease stability — where inflammation is controlled and no new hair loss occurs.

Living with LPP often involves psychological challenges due to the visible nature of hair loss. Support groups, counseling, and open communication with healthcare providers can help manage the emotional impact. Regular follow-ups with a trichologist or dermatologist are essential to monitor disease activity, adjust treatment plans, and address any new concerns.

Common Questions About Lichen Planopilaris

Can Lichen Planopilaris be cured?

Currently there is no cure for LPP. The goal of treatment is to halt progression, reduce inflammation, and manage symptoms. With effective treatment, the disease can often be brought into remission, preventing further scarring and preserving existing hair.

Is Lichen Planopilaris contagious?

No. LPP is an autoimmune condition — the body’s own immune system attacks its hair follicles. It cannot be passed from person to person.

How is Lichen Planopilaris different from Androgenetic Alopecia?

LPP is a scarring alopecia — inflammation permanently destroys hair follicles, leaving scar tissue. Androgenetic alopecia is a non-scarring alopecia driven by genetics and DHT; follicles remain intact and can potentially respond to treatment.

Will my hair grow back after Lichen Planopilaris treatment?

Hair will not regrow in areas where follicles have already been destroyed by scarring. Treatment aims to stop further loss and preserve existing follicles. Success means stabilization — not restoration of already lost hair.

What triggers Lichen Planopilaris flares?

Potential triggers include stress, certain medications, infections, and possibly hormonal fluctuations. The exact triggers are not fully understood, but identifying and minimizing personal triggers can be part of a comprehensive management plan.

Conclusion: A Proactive Approach to Managing LPP

Lichen Planopilaris is a challenging condition due to its irreversible nature, but a proactive and consistent approach to diagnosis and treatment can significantly impact its trajectory. Early identification of symptoms, definitive diagnosis through biopsy, and a tailored treatment plan involving topical, intralesional, and systemic therapies are key to managing inflammation, alleviating symptoms, and preserving hair follicles. Individuals affected by LPP are encouraged to work closely with a trichologist or dermatologist to develop an effective long-term management strategy and address both the physical and emotional aspects of the condition.