The Bottom Line

Periungual warts are warts caused by human papillomavirus (HPV) that grow around or under the nails. They are among the most difficult warts to treat because the nail provides protection and the skin folds around it are hard to reach with topical treatments. They are most common in children and young adults who bite their nails or pick at the skin around them. Without treatment they can spread, grow under the nail, and permanently damage the nail matrix. Cryotherapy (freezing) and salicylic acid are the standard first treatments, but stubborn cases often need multiple sessions or stronger interventions.

What Are Periungual Warts?

Warts (verrucae) are caused by human papillomavirus (HPV) infecting the outer layer of the skin. Periungual warts specifically grow in the skin immediately surrounding the nail — in the nail folds on the sides (lateral nail folds) and at the base (proximal nail fold), or under the nail itself (subungual). Periungual means surrounding the nail (from the Latin peri, around, and unguis, nail).

These warts are caused primarily by HPV types 1, 2, and 4. They are not the same HPV types that cause genital warts or cervical cancer — common skin warts pose no cancer risk in healthy people.

Periungual warts account for approximately 3% of all dermatology visits and are most prevalent in children and teenagers. They are notoriously persistent and have a higher recurrence rate than warts on other parts of the hand.

What Do They Look Like?

Periungual warts have a distinctive appearance:

  • Rough, cauliflower-like or mosaic surface with a grainy texture
  • Skin-colored, pink, or slightly brownish growths that range from a few millimeters to over a centimeter
  • Black dots inside the wart (when you look closely) — these are thrombosed capillaries, not wart seeds
  • Disruption of normal finger-print lines (dermatoglyphics) where the wart grows
  • If growing under the nail: the nail may lift, the nail plate may develop a groove or deformity, and there may be pain when pressing on the nail

Multiple warts often cluster together, and satellite lesions (small daughter warts) can appear around the main growth. In people who bite their nails, warts on fingers can be inadvertently transferred to the lips or mouth.

Why Are They So Common Around the Nails?

Several factors make the periungual area particularly susceptible to HPV infection:

  • Nail biting (onychophagia) and cuticle picking: These habits create tiny breaks in the skin that allow HPV to enter. Studies show periungual warts are 3-4 times more common in nail biters than non-biters
  • Moisture: The nail folds trap moisture, creating an environment where HPV persists
  • Trauma: Minor cuts or hangnails around the nail create entry points for the virus
  • Immunosuppression: People with weakened immune systems (organ transplant recipients, HIV) are particularly prone to extensive, treatment-resistant periungual warts

Treatment Options

Periungual warts are notoriously stubborn. No single treatment works for everyone, and multiple sessions are almost always needed. Spontaneous resolution does occur in children (about 65% of warts in children resolve within 2 years), but warts in adults and warts around the nails tend to persist much longer. Treatment prevents spread, reduces discomfort, and limits nail damage.

Salicylic Acid

Over-the-counter and prescription salicylic acid preparations (17-40% concentration) are the first-line at-home treatment. The acid dissolves the wart tissue gradually. Protocol: soak the area in warm water for 5 minutes, file the dead surface with an emery board, then apply the acid and cover with tape overnight. Daily treatment for 8-12 weeks is typical. Cure rates of 50-70% have been reported with good adherence, though periungual location reduces effectiveness compared with warts on flat skin.

Cryotherapy (Liquid Nitrogen)

Freezing with liquid nitrogen (-196°C) is the most commonly used in-office treatment. The freeze destroys the wart tissue, and the immune system clears the viral cells afterward. For periungual warts, treatments are given every 2-4 weeks. Each session involves 1-3 freeze-thaw cycles. Cure rates are around 50-70% for warts overall, but periungual warts require more sessions than warts on other sites. Side effects include blistering, pain, and temporary discoloration of the skin. Cryotherapy near the nail matrix must be done carefully to avoid permanent nail damage.

Combination Therapy

Combining cryotherapy with salicylic acid between sessions significantly improves cure rates compared with either treatment alone, and this approach is now widely recommended.

Immunotherapy

When warts persist despite standard treatments, topical or intralesional immunotherapy helps stimulate the patient's immune system to recognize and fight the wart virus:

  • Topical diphencyprone (DPCP) or squaric acid dibutylester (SADBE): Contact sensitizers applied to the warts at increasing concentrations; creates a local allergic reaction that clears the wart in 60-80% of patients
  • Intralesional Candida antigen or mumps/Trichophyton antigen: Injected directly into the wart, triggering an immune response; effective in 60-70% of cases

Other Treatments

  • Bleomycin injection: An anti-cancer drug injected directly into stubborn warts; highly effective (70-90% cure rate) but painful and should only be used in experienced hands due to risk of nail matrix damage
  • Laser therapy (pulsed dye laser or CO2 laser): Useful for resistant warts, though expensive and sometimes requires anesthesia
  • Surgical excision or curettage: Can remove the wart tissue, but recurrence rates are high (up to 30%) and scarring is possible
  • Topical cidofovir or imiquimod: Antiviral and immune-modulating options used off-label for immunocompromised patients with widespread warts

What Does Not Work

Cutting, biting, or picking at periungual warts typically spreads the virus to new sites rather than eliminating it. Home remedies like duct tape therapy have weak evidence and are unlikely to clear periungual warts without additional treatment.

When to See a Dermatologist

  • Warts around the nail are growing, multiplying, or spreading to nearby fingers
  • A wart is growing under the nail or causing nail deformity
  • Over-the-counter treatments have been used consistently for 3 months without improvement
  • Warts are painful, bleeding, or interfering with daily activities
  • You are immunocompromised — periungual warts can become very extensive and hard to treat in this setting
  • You are a child or parent concerned about school or social stigma related to visible warts

Frequently Asked Questions

Are periungual warts contagious?

Yes. The HPV virus that causes warts can spread to other areas of your skin (autoinoculation) through touching, scratching, or biting. It can also spread to other people through shared surfaces or direct skin contact, though transmission generally requires a break in the skin. Avoid sharing nail files, clippers, or towels, and wash hands after touching warts.

Will warts go away on their own without treatment?

In children, yes — about 65% of warts clear spontaneously within 2 years. In adults, spontaneous resolution is less reliable and may take much longer. Periungual warts especially tend to persist because the nail provides a protective barrier. Treatment speeds resolution, prevents spread, and avoids nail damage from long-standing warts.

How can I stop warts from coming back?

Stop nail biting and cuticle picking — these are the primary risk factors for both developing and spreading periungual warts. Keep fingertips dry and intact. If you are a nail biter, treating the habit (with bitter nail polish or behavioral strategies) dramatically reduces recurrence risk. Boosting immune function by maintaining good general health also helps keep HPV at bay once cleared.

How many cryotherapy sessions will I need?

Most periungual warts require 4-8 sessions of cryotherapy, spaced 2-4 weeks apart, sometimes more. Results vary considerably depending on the size and duration of the wart, the patient's immune response, and whether combination therapy is used. Your dermatologist will reassess at each visit and may switch strategies if adequate progress is not being made after 3-4 sessions.

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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.