The Bottom Line

Trachyonychia (pronounced trak-ee-oh-NIK-ee-ah) is a nail condition that makes nails look rough, dull, and sandpaper-like. It can affect one nail or all twenty — when all twenty are involved, it is historically called twenty-nail dystrophy. It most commonly appears in children between ages 3 and 12. The good news is that trachyonychia is not a sign of serious illness in most children, and approximately half of cases resolve on their own within a few years. Treatment is available but often optional, since the condition typically does not affect health — only nail appearance.

What Is Trachyonychia?

The word comes from the Greek trachys (rough) and onyx (nail). Trachyonychia describes a specific pattern of nail changes where the nail surface becomes rough and loses its normal shine. It was first described under the name twenty-nail dystrophy in 1977 because many patients — particularly children — had all twenty nails affected simultaneously. We now know the condition can affect any number of nails, and the term trachyonychia is the more precise medical name.

It is most common in children and adolescents, though adults can also be affected. In most pediatric cases, it appears between ages 3 and 12 and tends to improve or resolve by adulthood.

What Do the Nails Look Like?

Trachyonychia comes in two forms that look slightly different:

Opaque Trachyonychia

This is the more common form. The nail loses its translucency and becomes white, opaque, and rough. The surface has a sandpaper-like texture with fine longitudinal ridges. The nails may look grayish-white and dull. The nail edges are often fragile and may chip or split.

Shiny Trachyonychia

In this less common form, the nail has a silvery sheen from numerous fine parallel ridges (like the surface of a brushed-metal object). Despite the name, this version actually reflects some shine from the ridged surface. This form tends to be associated with a better prognosis.

In both forms, the cuticles may be rough and ragged, and the nail plate may be thin. Importantly, trachyonychia is usually painless, and nail growth is not significantly impaired.

What Causes It?

Trachyonychia results from inflammation affecting the nail matrix — the cells that produce the nail plate. When the matrix is inflamed, it produces an irregular, rough nail instead of a smooth one. Several conditions can cause this matrix inflammation:

Alopecia Areata

The most common associated condition, particularly in children. Alopecia areata is an autoimmune disease that causes patchy hair loss. Nail changes (including trachyonychia) occur in 10-30% of alopecia areata patients. Some children with alopecia areata have nail changes before, during, or even without any hair loss — trachyonychia can be the sole manifestation of the underlying immune process.

Lichen Planus

Lichen planus of the nail matrix can produce trachyonychia. In children, lichen planus-associated trachyonychia is important to identify because lichen planus can cause permanent nail damage if untreated.

Psoriasis

Psoriasis of the nail matrix is another cause, though psoriatic nail changes more often produce pitting, oil drops, and onycholysis in addition to surface roughness.

Idiopathic (No Identifiable Cause)

In many children — particularly those who are otherwise well — no underlying skin condition or systemic disease is found. This idiopathic form carries an excellent prognosis for spontaneous resolution.

How Is It Diagnosed?

The diagnosis is often clinical — a dermatologist can recognize the characteristic appearance. No biopsy is typically needed in straightforward pediatric cases. However, a thorough examination includes:

  • Looking at the scalp for hair loss patches (alopecia areata)
  • Examining the skin for psoriasis plaques or lichen planus lesions
  • Asking about family history (psoriasis, alopecia areata)
  • Checking all twenty nails for the extent of involvement

A nail biopsy (from the nail matrix) may be done when the diagnosis is uncertain, when lichen planus is suspected (because of the risk of scarring), or when the condition is not improving as expected. Biopsy in children is performed under local anesthesia.

Treatment

Treatment of trachyonychia depends on the cause and the degree of distress it is causing the child and family.

Watchful Waiting

For idiopathic trachyonychia in children — especially the shiny form — watchful waiting is a completely reasonable approach. Studies report spontaneous improvement or complete resolution in approximately 50% of children within 3-6 years. If the condition is not causing pain, nail loss, or significant psychological distress, monitoring without treatment is appropriate.

Topical Treatments

  • Topical corticosteroids: High-potency steroids applied to the nail folds under occlusion (wrapping the finger overnight) can reduce matrix inflammation and improve nail texture over months
  • Topical tacrolimus or pimecrolimus: Non-steroidal anti-inflammatory options that can be used when steroid side effects are a concern
  • Tazarotene: A topical retinoid that may help normalize nail matrix cell turnover in some patients

Intralesional Corticosteroid Injections

Injections of triamcinolone into the nail matrix are effective for trachyonychia but are painful and require local anesthesia. They are generally reserved for older children or adults who need faster results and can tolerate the procedure.

Systemic Treatments

For severe cases or those associated with widespread alopecia areata or lichen planus, systemic treatments (oral cyclosporine, oral steroids, or newer JAK inhibitors for alopecia areata) may be used, though these carry more risks and are generally reserved for refractory situations.

Nail Care

Keeping nails short to minimize trauma, avoiding aggressive nail cleaning or manipulation, and applying moisturizer to the nail folds can reduce secondary damage and make nails more cosmetically acceptable while the condition runs its course.

When to See a Dermatologist

  • Your child has rough, dull, or sandpaper-textured nails on multiple fingers or toes
  • You notice hair loss patches on the scalp alongside nail changes
  • The nail changes are causing your child distress at school due to appearance
  • Nails are painful, splitting, or not growing properly
  • An adult develops sudden rough, dull changes across multiple nails
  • A prior diagnosis of trachyonychia is worsening rather than improving over years

Frequently Asked Questions

Is trachyonychia contagious or caused by a fungus?

No. Trachyonychia is not contagious and is not caused by a fungal infection. It is an inflammatory condition of the nail matrix. This distinction is important because antifungal treatment will not help. A fungal culture of nail scrapings is negative in trachyonychia, which helps confirm the diagnosis.

Will my child's nails ever look normal?

In most children with idiopathic trachyonychia, yes — nails typically improve significantly or normalize by adolescence or early adulthood. The prognosis is best for the shiny form and for children without an associated skin condition. Even in the opaque form, spontaneous improvement is common.

Does trachyonychia mean my child will develop alopecia areata?

Not necessarily. While trachyonychia is associated with alopecia areata, many children with trachyonychia never develop hair loss. The nail change can represent a very limited expression of the underlying immune tendency. Your dermatologist can monitor your child's scalp at routine visits.

Is there anything I can do at home to help?

Yes. Keep nails trimmed short to prevent catching and tearing. Apply a good moisturizer (urea cream or petroleum jelly-based products) to the nail folds daily. Avoid acetone-based nail polish removers. Biotin supplements (2.5 mg daily) are commonly recommended for brittle nails and are generally safe, though specific evidence for trachyonychia is limited.

  1. Tosti A, Bardazzi F, Piraccini BM, Fanti PA. Idiopathic trachyonychia (twenty-nail dystrophy): a pathological study of 23 patients. Br J Dermatol. 1994;131(6):866-872.
  2. Iorizzo M, Tosti A, Di Chiacchio N, et al. Nail lichen planus in children: clinical features, response to treatment, and long-term follow-up. Pediatr Dermatol. 2012;29(1):25-28.
  3. Piraccini BM, Starace M. Nail disorders in infants and children. Curr Opin Pediatr. 2014;26(4):440-445.
  4. Kumar MG, Ciliberto H, Bayliss SJ. Long-term follow-up of pediatric trachyonychia. Pediatr Dermatol. 2015;32(2):198-200.

Trusted Resources

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.