Nail Lichen Planus: Why Your Nails Are Changing and What Can Be Done

What Is Nail Lichen Planus?

Lichen planus is an inflammatory condition caused by your own immune system mistakenly attacking skin, mucous membranes, or nails. When it targets the nails, it is called nail lichen planus (NLP). It can affect one nail or all twenty — fingernails and toenails alike — and it can occur with or without lichen planus anywhere else on your body.

The inflammation targets the nail matrix, which is the living tissue under the base of the nail that generates new nail cells. When the matrix is damaged, the nail that grows out is thin, brittle, and distorted. In severe or untreated cases, scar tissue can replace the matrix entirely, leading to permanent nail loss — a complication called pterygium unguis, where skin grows over the nail bed where the nail used to be.

NLP is not contagious and is not caused by a fungal or bacterial infection. It is an immune-mediated process, similar in nature to conditions like alopecia areata or autoimmune thyroid disease.

What Do the Nail Changes Look Like?

Nail lichen planus can produce a range of changes, often starting subtly and becoming more pronounced over time:

• Longitudinal ridging and furrowing: Fine lines running the length of the nail, giving the nail a striated or washboard appearance
• Nail thinning: Nails become fragile and may split along the ridges (onychoschizia)
• Brittle nails that break easily at the free edge
• Discoloration: Nails may look dull, grayish, or brownish rather than translucent pink
• Pterygium unguis: A V-shaped or triangular scar of skin that advances from the cuticle onto the nail surface, eventually splitting the nail — this is the hallmark of severe NLP
• Nail loss (anonychia): In advanced cases, the nail may disappear entirely and not regrow
• Subungual hyperkeratosis: Buildup of material under the nail that causes the nail to lift

The toenails, especially the big toenail, may show more severe changes. Pain and tenderness are not always present, but the nails can become sore when pressed or during daily activities.

What Causes It?

The root cause is immune system dysfunction. T-lymphocytes — a type of immune cell — begin attacking the nail matrix cells as if they were foreign invaders. Researchers do not fully understand why this happens, but several factors appear to play a role:

• Genetic predisposition: Certain immune-related genes are more common in people with lichen planus
• Medications: Some drugs can trigger lichen planus-like reactions, including certain blood pressure medications (beta-blockers, ACE inhibitors), NSAIDs, antimalarials, and gold-based treatments
• Hepatitis C infection: There is a well-documented association; people with HCV are more likely to develop lichen planus
• Stress and illness: Immune disruption from illness or psychological stress can trigger or worsen flares

In many cases, no specific trigger is identified.

How Is Nail Lichen Planus Diagnosed?

Your dermatologist will examine your nails carefully and look for lichen planus elsewhere on your body — particularly the classic flat-topped purple bumps on the wrists or inner forearms, and white lacy patches inside the mouth. These findings together support the diagnosis.

When the diagnosis is uncertain, a nail biopsy may be performed. A small piece of tissue from the nail matrix or nail bed is removed and examined under a microscope. Biopsy findings in NLP typically show a band of inflammatory cells at the junction between the epidermis and dermis, called a lichenoid infiltrate. Blood tests may be ordered to rule out hepatitis C and check thyroid function.

Treatment Options

No single treatment works for everyone, and NLP can be stubborn. The goal is to reduce inflammation, prevent permanent damage, and preserve as much nail tissue as possible.

Corticosteroid Injections

Injections of triamcinolone directly into or around the nail matrix are often considered first-line for NLP. Studies show improvement in 60-80% of patients after a series of monthly injections. The injections can be uncomfortable, but they deliver anti-inflammatory medication directly where it is needed. Many dermatologists use a topical anesthetic or nerve block to reduce discomfort.

Topical Steroids

High-potency topical steroids applied to the nail folds and proximal nail fold under occlusion (wrapped with film overnight) can reduce inflammation in milder cases. Results are slower than injections but more comfortable.

Systemic Treatments

When multiple nails are affected or injections are not tolerated, systemic (whole-body) medications may be needed:

• Oral corticosteroids (prednisone): Effective for reducing acute inflammation but not suitable for long-term use due to side effects
• Hydroxychloroquine (an antimalarial): Often used for long-term management with a favorable safety profile
• Acitretin (a retinoid): Useful in some patients, particularly those with severe or widespread involvement
• Cyclosporine or methotrexate: Immunosuppressant options for severe, treatment-resistant cases
• JAK inhibitors (tofacitinib, baricitinib): Emerging evidence suggests these newer immune-modulating drugs may benefit NLP, though nail-specific data is still limited

Nail Protection

Protecting fragile nails helps prevent secondary trauma. Keep nails short, avoid harsh nail products, wear gloves for wet work, and use nail hardeners cautiously (avoid formaldehyde-based products).

When to See a Dermatologist

• You notice unexplained ridging, thinning, or splitting across multiple nails
• A scar-like change is appearing at the base of a nail (pterygium forming)
• Nails are becoming progressively distorted over weeks to months
• You have been diagnosed with lichen planus of the skin or mouth and now notice nail changes
• Your nails are painful or interfering with daily activities
• A prior diagnosis of nail fungus has not responded to antifungal treatment (NLP is sometimes misdiagnosed as fungal nail disease)

Frequently Asked Questions

Will my nails grow back normally after treatment?

If treatment starts before permanent scarring occurs, nails can often recover significantly. Once pterygium — the scar tissue bridging the cuticle to the nail — forms, that specific area will not regenerate. Early treatment is the most important factor in preserving nail tissue.

Is nail lichen planus the same as nail fungus?

No, though they can look similar. Fungal nail infections typically cause yellowing, thickening, and crumbling of the nail tip rather than the fine ridging and thinning more typical of NLP. A fungal culture or PAS stain on nail clippings can distinguish the two. Some patients have both conditions simultaneously, which complicates diagnosis.

Can nail lichen planus go away on its own?

Unlike lichen planus of the skin, which often resolves within 1-2 years, nail lichen planus tends to be more persistent. Spontaneous remission does occur but is less predictable, and waiting without treatment increases the risk of permanent nail loss. Most specialists recommend treating NLP promptly.

Should I be tested for hepatitis C?

Your dermatologist will likely recommend hepatitis C testing because there is a known association between HCV infection and lichen planus. If HCV is found and treated, lichen planus sometimes improves as well.

Trusted Resources

• American Academy of Dermatology - Lichen Planus Overview
• Mayo Clinic - Lichen Planus
• National Institute of Arthritis and Musculoskeletal and Skin Diseases - Lichen Planus

Always consult a board-certified dermatologist for an accurate diagnosis and personalized treatment plan. This article is for educational purposes only and does not replace professional medical advice.