Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Township, MI
Last reviewed: May 2026
Nail lichen planus is frequently misdiagnosed as onychomycosis (fungal infection) for years — the treatments are completely different, and continuing antifungals for a condition that requires topical or systemic steroids delays resolution and risks drug side effects. A nail biopsy is the only way to confirm the diagnosis. Call (810) 206-1402 — nail evaluation in Michigan.
Nail lichen planus (nail LP) is an inflammatory dermatosis affecting the nail unit — the nail matrix, nail bed, nail folds, and hyponychium — producing a characteristic spectrum of nail changes that range from longitudinal ridging and thinning to total nail destruction (twenty-nail dystrophy). It accounts for approximately 10% of all lichen planus cases and is clinically important because nail involvement can occur in isolation without skin or mucosal lichen planus, and because severe matrix involvement produces irreversible nail loss (pterygium unguis) if not treated early. Toenails are involved less commonly than fingernails, but toenail involvement presents with the same spectrum of changes and the same risk of permanent nail destruction.
Nail Lichen Planus: Clinical Features and Differential Diagnosis
| Feature | Nail Lichen Planus | Onychomycosis (Nail Fungus) | Psoriatic Nails | Trachyonychia (Twenty-Nail Dystrophy) |
|---|---|---|---|---|
| Nail plate appearance | Longitudinal ridging (striae); thinning; splitting; friable brittle nail; may progress to total nail destruction | Subungual hyperkeratosis; yellow-brown-white discoloration; nail thickening; onycholysis; debris under nail | Pitting (small ice-pick pits); onycholysis; oil-drop sign (salmon patch); subungual hyperkeratosis; nail thickening | Diffuse longitudinal ridging and sandpaper-like roughness of all 20 nails; nail plate thinning; no subungual debris |
| Pathognomonic finding | Pterygium unguis — forward extension of proximal nail fold over nail plate, obliterating the nail — indicates matrix scarring; IRREVERSIBLE once established | Positive KOH or culture; dermatophytoma streak; proximal subungual pattern suggests immunocompromise | Geometric pitting (multiple, regular); oil-drop discoloration; psoriatic plaques on skin; arthritis | All nails affected (20); no pitting or oil-drop sign; no subungual debris; nail plate thin and ridged |
| Nail matrix involvement | Primary pathology — inflammation and scarring of matrix produces all nail plate changes; matrix biopsy diagnostic | Usually absent — fungi primarily in nail bed and plate; matrix involvement in proximal subungual type only | Nail matrix inflammation produces pitting; nail bed inflammation produces oil-drop sign and onycholysis | Matrix inflammation (idiopathic or LP-related); all 20 nails ridged from diffuse matrix involvement |
| Associated features | Cutaneous LP (flat-topped violaceous papules on wrists, ankles); oral LP (white Wickham striae on buccal mucosa); 10-15% nail LP without skin lesions | Adjacent tinea pedis; immunocompromise; diabetic neuropathy; nail trauma history | Psoriatic plaques on skin; scalp psoriasis; psoriatic arthritis; positive family history | LP (most common association); alopecia areata; atopic dermatitis; idiopathic; usually children or young adults |
| Reversibility | Reversible if treated before pterygium forms; IRREVERSIBLE once pterygium unguis established (scar tissue in matrix) | Reversible with antifungal treatment; recurrence common; cure rates 50-70% with oral terbinafine | Nail psoriasis improves with systemic treatment; biologics most effective | Often spontaneously improves in children; adults more persistent; LP-associated cases improve with LP treatment |
Nail Lichen Planus: Severity Staging and Treatment Protocol
| Severity | Clinical Features | Treatment Options | Expected Outcome |
|---|---|---|---|
| Mild (1-5 nails; no pterygium) | Longitudinal ridging; mild thinning; splitting of 1-5 nails; no proximal nail fold adherence | Topical corticosteroid (clobetasol 0.05% under occlusion nightly); topical tacrolimus 0.1%; nail lacquers with urea for brittleness; patient education on pterygium risk | 50-70% stabilization and partial improvement with topical therapy; close monitoring for pterygium development |
| Moderate (5+ nails; at-risk for pterygium) | Multiple nail involvement; thinning and fragility; early proximal nail fold adherence; approaching pterygium formation | Intralesional triamcinolone acetonide (2.5-5 mg/mL) injected at proximal nail fold quarterly; systemic corticosteroid short course (prednisone 0.5 mg/kg/day x 4-6 weeks); topical as adjunct | Intralesional steroids most effective for matrix sparing; 60-80% halt of progression; new nail growth requires 6-12 months to assess |
| Severe (pterygium forming; major nail loss) | Pterygium unguis present; significant nail plate loss; 10+ nails involved; severe ridging and thinning | Systemic immunosuppression: prednisone + methotrexate; hydroxychloroquine; acitretin (retinoid); cyclosporine; case reports of JAK inhibitors (tofacitinib) | Cannot reverse established pterygium — treatment arrests further destruction; partial regrowth of remaining nail possible; 40-60% meaningful response to systemic therapy |
| Total nail destruction | All nails destroyed; pterygium all nails; no nail plate present; nail folds scarred | Systemic immunosuppression for any remaining intact nails; accept cosmetic prosthetic nails for destroyed nails; pain management | Cannot restore destroyed nails; systemic therapy prevents further nail loss in remaining nails; prognosis poor for full recovery |
At Balance Foot & Ankle in Howell and Bloomfield Township, toenail lichen planus is distinguished from onychomycosis by the absence of subungual debris, the longitudinal ridging pattern, and the presence of pterygium unguis — biopsy is obtained from the proximal nail fold when clinical diagnosis is uncertain, and dermatology co-management is initiated early for any patient with multiple nail involvement because pterygium formation is irreversible. Call (810) 206-1402.
American Academy of Dermatology: Lichen Planus
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Doctor Answer
What is lichen planus of the toenail and how is it treated?
Nail lichen planus is an inflammatory condition causing toenail thinning, ridging, splitting, pterygium formation (scarring of the nail fold over the nail plate), and sometimes permanent nail loss. It is diagnosed by clinical appearance and nail biopsy and treated with topical or intralesional corticosteroids and systemic agents in severe cases. Dr. Tom Biernacki at Balance Foot & Ankle recognizes nail lichen planus and coordinates appropriate treatment to manage inflammation and preserve as much nail as possible.
Dr. Tom Biernacki, DPM is a board-certified foot & ankle surgeon (ABFAS & ABPM) at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has made him one of the most-followed foot & ankle educators on YouTube.
More questions patients ask
What does nail lichen planus look like?
Nail lichen planus causes: longitudinal ridging and striations, nail thinning and fragility, pterygium formation (wing-like scar tissue fusing the cuticle to the nail), and in severe cases, permanent nail loss with scarring. It differs from fungal nail by the absence of subungual debris and the symmetrical, longitudinal pattern — fungus typically causes distal and lateral subungual onychomycosis with yellowing and thickening. Diagnosis requires nail biopsy.
How is nail lichen planus treated?
First-line: intralesional or topical corticosteroids (triamcinolone injected into the nail matrix) — effective in 50–70% of cases. Systemic treatments for widespread disease: cyclosporine, acitretin, or hydroxychloroquine. Tofacitinib (a JAK inhibitor) has shown promising results in recent case series. Treatment is prolonged (6–12 months) and relapse is common. Early aggressive treatment reduces the risk of permanent nail scarring and pterygium.
Can lichen planus on the toenails be cured?
Lichen planus of the nails is a chronic, relapsing condition — 'cure' is not the typical outcome, but sustained remission is achievable with appropriate treatment. Approximately 30–40% of patients achieve complete nail clearing with treatment; others achieve partial improvement or require maintenance therapy. Permanent nail loss occurs in untreated or treatment-resistant severe cases, making early diagnosis and treatment critical.
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