What Causes White Spots on Nails?

Key takeaways

• White marks on nails most commonly stem from a nail injury known as leukonychia.
• Other possible triggers include allergic reactions, fungal infection, nutrient shortfalls, or heavy metal exposure.
• Treatment depends on the root cause and may involve medications, avoiding irritants, or simply allowing the nails time to recover.

You might notice white flecks or patches on your nails at some point. In most cases, this discoloration isn’t a sign of a serious illness.

A frequent reason for these marks is trauma to the nail matrix. White areas that arise from such trauma are termed leukonychia. These injuries can happen if you accidentally trap a finger in a door or hit the fingertip with a tool.

Beyond nail trauma, multiple other factors can produce white spots. This article outlines the potential causes of white nail discoloration and when to seek medical advice.

What are the symptoms and appearance of leukonychia?

Leukonychia is damage to the nail matrix, the area at the base of the nail responsible for producing the nail plate. When this region is injured, white marks can appear as the nail grows out.

Because nails take time to grow, you might not recall the specific injury that led to the white spots. Signs of leukonychia may not be visible for about 4 weeks or longer.

What are the different types of leukonychia?

Leukonychia is commonly divided into two categories:

• True leukonychia: Originates in the nail matrix, the portion that creates the nail. True leukonychia can be complete whitening of the nail plate (total leukonychia), often affecting all 20 nails, or partial whitening (partial leukonychia), affecting one, several, or all nails to varying degrees.
• Apparent leukonychia: Involves a problem with the nail bed beneath the nail rather than the nail-producing matrix itself.

What does leukonychia look like?

In some people, leukonychia appears as tiny speckled dots across the nail. In others, the white areas are larger and may span much of the nail plate. One or several nails can be involved.

Leukonychia can present as:

• minute pinhead-sized dots (punctate leukonychia), a frequent pattern
• more substantial linear marks along the nail (longitudinal leukonychia)
• larger spots or horizontal bands parallel to the nail base (striate or transverse leukonychia)

What are other potential causes of white spots on the nails?

Aside from leukonychia, several other factors can produce white areas on nails, such as:

• an allergic reaction
• fungal infection
• inherited mutations or uncommon syndromes
• repeated manicures
• certain medications
• heavy metal exposure
• vitamin or mineral shortages
• skin disorders
• systemic diseases

Read on for more detail about these possible causes.

Allergic reaction

An allergy to nail polish, topcoat, hardener, or polish remover can lead to white spots on nails.

Chemicals used in applying or removing acrylic or gel nails can also significantly damage the nail and produce these marks.

Fungal infection

A common nail fungus called white superficial onychomycosis can affect toenails. Early signs may include a few small white spots on the nail.

The infection can spread into the nail bed. Toenails may initially look white and flaky and later become thickened and brittle.

Hereditary mutations or rare disorders

True leukonychia can be inherited, though this is very uncommon.

A genetic mutation causes it, and one or both parents can pass it to a child. People born with hereditary true leukonychia usually present with total whitening of the nails at birth or in infancy.

In other situations, leukonychia can be part of rare conditions, including:

• Bart-Pumphrey syndrome, which may include nail changes, knuckle problems, and hearing loss
• Bauer syndrome, which can bring about leukonychia and skin cysts
• Buschkell-Gorlin syndrome, which can cause nail abnormalities, kidney stones, and skin cysts
• Darier disease (keratosis follicularis), which may cause nail changes and wart-like lesions

Frequent manicures

Regular manicures can damage nails and produce white spots. Pressure from tools or pressure applied during procedures may harm the nail bed or matrix.

Medications

Certain drugs can lead to white areas on nails. These include chemotherapy agents used in cancer treatment and sulfonamides prescribed for bacterial infections.

Heavy metal poisoning

Exposure to heavy metals like arsenic or lead can cause lines to form on the nail plate. If you have additional signs of heavy metal poisoning, seek medical care promptly.

Blood testing can identify elevated levels of these metals.

Mineral deficiency

White spots can appear if you lack certain minerals or vitamins. Zinc and calcium deficiencies are most often linked to this finding.

A physician can evaluate whether you are at risk for nutrient deficiencies.

Skin conditions

Inflammatory skin disorders such as nail psoriasis and hand eczema can affect the nail matrix and produce abnormal spotting in the nail plate.

Leukoderma creates white patches beneath the nail and can be mistaken for whitening of the nail itself.

Systemic illness

Occasionally, white markings on nails reflect an underlying health issue. Though less common, possible systemic causes include:

• heart disease
• kidney failure
• pneumonia
• anemia (low iron)
• liver cirrhosis
• diabetes
• overactive thyroid (hyperthyroidism)

These causes are rare. If you have persistent nail changes or other concerning symptoms, a clinician will usually evaluate more common causes before considering these serious conditions.

How do doctors diagnose white spots on nails?

If the white spots are occasional and you suspect they result from minor trauma, you may not need medical attention. Avoiding suspected triggers—such as harsh polish removers or chemicals—may be sufficient.

If the spots remain or worsen, consult a doctor. Many causes are treatable once accurately identified.

At the visit, a clinician will examine the nails and may be able to make a diagnosis and suggest treatment based on the appearance.

To investigate the cause, doctors may order tests such as:

• Mycology: sending nail scrapings or clippings to be examined for fungal organisms under a microscope
• Nail biopsy: submitting a sample of nail or adjacent skin tissue for microscopic analysis
• Blood tests: checking for systemic disease, heavy metal levels, or nutrient deficiencies

If the diagnosis is unclear, a clinician may request multiple tests to rule out various possibilities, especially if a vitamin or mineral deficit is suspected.

How are white spots on nails treated?

Treatment is guided by the underlying cause. After diagnosis, a doctor might recommend one or more of the following approaches.

Avoid allergens and harsh chemicals

If an allergy is suspected, stop using the nail polish or other product you believe is responsible. If symptoms persist after discontinuing the product, see a doctor.

Antifungal medication

For nail fungus, clinicians commonly prescribe oral antifungal drugs and may also recommend topical antifungal agents.

Treatment can take weeks to years, and completing the full course is important to fully clear the infection.

Time and rest

Many nail injuries only require time to heal. As the nail grows, the damaged section moves toward the tip and will gradually be trimmed away, causing the white spots to fade.

Cosmetic treatments

If the discoloration persists or you want a short-term concealment, nail polish can help—provided polish isn’t the cause of the problem.

Choosing a polish close to your skin tone can help camouflage the spots.

Can anything be done to prevent white spots from appearing on your nails?

If white spots keep appearing, consider these prevention and next-step suggestions:

• Protect your nails: Avoid activities that might pinch, crush, or repeatedly hit your nails. Strengthening the nails can make them less prone to injury.
• Watch for new symptoms: Note any other changes in nail color or texture. New or progressive findings may warrant medical evaluation.
• See a doctor: If you suspect the spots aren’t from trauma, consult a clinician who can diagnose the issue and advise treatment.
• Eat for nail health: Maintain a balanced diet and adequate vitamin and mineral intake to reduce the risk of nutrient-related nail changes.

Because nails grow slowly, it can take time for white spots or lines to disappear completely. Fingernails generally take about 6 months to fully grow out, while toenails can require up to 18 months.

Takeaway

For most people, white spots on nails are not a sign of a major problem. They frequently result from minor trauma and resolve as the nail grows out.

However, if spots appear along with other symptoms or continue to develop, they could signal another issue, such as an allergic reaction.

A doctor can evaluate your nails, determine the cause, and recommend appropriate treatment.