Nail Lichen Planus

Overview

Nail lichen planus is a chronic inflammatory condition in which the immune system attacks the nail unit, including the nail matrix, nail bed, and surrounding tissues. It represents one of the most clinically significant forms of lichen planus because of its potential to cause irreversible scarring and permanent nail loss if left untreated. The condition may affect one or several nails simultaneously, and its severity can range from mild cosmetic changes to complete destruction of the nail apparatus.

Lichen planus is a condition that can affect the skin, mucous membranes, scalp, and nails. Nail involvement is estimated to occur in approximately 10 percent of individuals with cutaneous lichen planus, though nail lichen planus can also present in isolation without other signs of the disease elsewhere on the body. Because of the risk of permanent nail scarring, early recognition and prompt dermatological assessment are strongly recommended.

Causes and Risk Factors

The precise cause of nail lichen planus is not fully understood; however, the condition is recognised as an immune-mediated disorder. T-lymphocytes, a type of white blood cell, are believed to mistakenly target the basal layer of the nail matrix epithelium, triggering an inflammatory response that damages the structures responsible for healthy nail growth.

Several factors have been associated with an increased likelihood of developing lichen planus, including nail involvement:

• Autoimmune conditions: Individuals with other immune-mediated disorders, such as thyroid disease, alopecia areata, or inflammatory bowel disease, may be at higher risk.
• Medications: Certain drugs, including beta-blockers, antimalarials, nonsteroidal anti-inflammatory drugs, and some antihypertensive agents, have been reported to trigger lichenoid reactions.
• Hepatitis C infection: A well-established association exists between lichen planus and hepatitis C virus infection, particularly in certain geographic populations.
• Genetic predisposition: A family history of lichen planus or other autoimmune conditions may contribute to susceptibility.
• Psychological stress: Emotional stress has been reported as a potential trigger or exacerbating factor, although the relationship is not fully established.

Nail lichen planus is observed across all age groups but is most commonly diagnosed in adults between the ages of 30 and 60. It affects individuals of all sexes, though some studies suggest a slight predominance in females.

Signs and Symptoms

The clinical presentation of nail lichen planus is variable and depends on which part of the nail unit is most affected. Because the nail matrix is responsible for nail plate production, matrix involvement often produces the most pronounced structural changes.

Common signs and symptoms include:

• Longitudinal ridging and furrowing: Fine or coarse lines running lengthwise along the nail plate are among the earliest and most characteristic findings.
• Nail thinning: The nail plate may become progressively thinner, brittle, and prone to splitting or breaking.
• Onycholysis: Separation of the nail plate from the underlying nail bed may occur, sometimes accompanied by discolouration beneath the nail.
• Pterygium formation: One of the most clinically significant findings, pterygium involves the forward extension of the proximal nail fold skin over the nail plate, ultimately fusing with the nail bed. This is a marker of scarring and may result in permanent nail loss in the affected area.
• Nail discolouration: Affected nails may appear dull, grey, or brownish in colour.
• Subungual hyperkeratosis: Thickening of the tissue beneath the nail plate can cause the nail to appear elevated or irregularly contoured.
• Complete nail loss: In severe or advanced cases, the nail plate may be entirely shed and fail to regrow if the matrix has been permanently scarred.

Nail lichen planus is not typically associated with significant pain, though tenderness or discomfort may be present in some cases, particularly when nails are fragile and prone to trauma. The fingernails are more frequently affected than the toenails.

Diagnosis

Diagnosis of nail lichen planus is based on clinical examination findings, patient history, and, in many cases, histopathological analysis. Because several nail conditions share overlapping features with nail lichen planus, including onychomycosis (fungal nail infection), psoriasis, and trachyonychia, accurate diagnosis is essential to guide appropriate treatment.

The diagnostic process typically includes the following:

• Clinical examination: A dermatologist will assess the pattern of nail changes, the number of nails involved, and the presence of lichen planus at other body sites such as the skin, oral mucosa, or scalp.
• Dermoscopy: A handheld instrument called a dermoscope may be used to magnify and examine the nail plate and periungual tissues in greater detail.
• Nail biopsy: A biopsy of the nail matrix or nail bed is often required to confirm the diagnosis. Histopathology typically demonstrates a band-like lymphocytic infiltrate at the dermoepidermal junction, which is characteristic of lichen planus.
• Fungal culture and microscopy: Nail clippings may be submitted for laboratory analysis to exclude onychomycosis, which can coexist with or mimic nail lichen planus.
• Blood tests: Investigations for hepatitis C, thyroid function, and other associated conditions may be ordered depending on the clinical context.

Treatment Options

The goals of treatment for nail lichen planus are to suppress the inflammatory process, preserve nail structure, prevent irreversible scarring, and restore cosmetic appearance where possible. Because the condition can lead to permanent nail loss, treatment is recommended as early as possible. There is no universally curative therapy, and management is often tailored to the severity of involvement and the patient's overall health profile.

Treatment options may include:

• Intralesional corticosteroid injections: Triamcinolone acetonide injected directly into the nail matrix or periungual tissue is often considered a first-line treatment for nail lichen planus. This delivers anti-inflammatory medication precisely to the site of disease activity.
• Systemic corticosteroids: Oral corticosteroids such as prednisone may be used for short courses in patients with severe or rapidly progressive disease affecting multiple nails.
• Topical corticosteroids: High-potency topical steroids applied to the proximal nail fold may be used as adjunctive therapy, particularly in milder cases or in patients who are not candidates for injections.
• Systemic immunosuppressants: Medications such as hydroxychloroquine, acitretin, methotrexate, or cyclosporine may be considered in refractory or widespread cases where corticosteroids alone are insufficient or poorly tolerated.
• Topical calcineurin inhibitors: Tacrolimus or pimecrolimus applied to periungual skin may serve as steroid-sparing alternatives in selected patients.
• Identification and withdrawal of triggering medications: If a drug-induced lichenoid reaction is suspected, discontinuation of the offending agent under medical supervision may lead to improvement.

Response to treatment can be slow, and nail regrowth following successful suppression of inflammation may take many months given the slow pace of nail plate regeneration. Ongoing monitoring by a dermatologist is important to assess treatment response and adjust therapy as needed. Prescription management of these medications is available at the Centre for Medical and Surgical Dermatology.

When to Seek Medical Attention

Early evaluation by a dermatologist is strongly advised when nail changes such as progressive ridging, thinning, or splitting are noticed, particularly if multiple nails are involved or if changes are worsening over time. Because pterygium formation represents irreversible scarring, prompt assessment and treatment before this stage is reached can make a significant difference in preserving nail function and appearance.

Medical attention should also be sought if nail changes are accompanied by skin rash, oral lesions, scalp hair loss, or if there is any personal or family history of autoimmune conditions. A thorough dermatological evaluation with Dr. Maksym Breslavets at the Centre for Medical and Surgical Dermatology can help confirm the diagnosis, rule out other causes of nail dystrophy, and establish an individualised treatment plan aimed at protecting long-term nail health. A referral from a family physician is typically required to access dermatology services.