The Centers for Advanced Orthopaedics
Maryland Orthopedic Specialists
A Division of The Centers for Advanced Orthopaedics
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Foot & Ankle

Plantar Warts

Plantar warts are a common benign skin condition caused by human papillomavirus (HPV) infecting the plantar (bottom) surface of the foot. Although not dangerous, they can become painful and persistent — especially when located directly under a weight-bearing surface. At Maryland Orthopedic Specialists, we distinguish plantar warts from calluses and other forefoot conditions and offer a range of targeted treatments, from topical therapy to definitive surgical excision.

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What is plantar warts?

Plantar warts are caused primarily by HPV types 1, 2, and 4 — strains that infect the superficial layers of the skin (epidermis). HPV enters through small cuts or breaks in the plantar skin, favored by warm, moist environments such as pool decks, locker rooms, and public showers.

Plantar warts are caused primarily by HPV types 1, 2, and 4 — strains that infect the superficial layers of the skin (epidermis). HPV enters through small cuts or breaks in the plantar skin, favored by warm, moist environments such as pool decks, locker rooms, and public showers. Once established, the virus induces thickened, hyperkeratotic skin growth.

Unlike warts on the hand (verruca vulgaris), which grow outward, plantar warts develop an endophytic (inward) growth pattern due to the constant pressure of weight-bearing. This forces the wart deep into the dermis, explaining why they can be painful despite appearing relatively flat on the surface.

Distinguishing plantar warts from calluses:

  • Warts disrupt normal skin lines (dermatoglyphics), often contain small pinpoint black dots (thrombosed capillaries), and are painful with lateral pinch rather than direct pressure.
  • Calluses maintain skin line continuity, are smooth and uniform, and are painful primarily with direct pressure.
  • Mosaic warts: Clusters of multiple coalescing warts; particularly resistant to treatment.

Children and adolescents: Plantar warts in immunocompetent children and teenagers frequently resolve spontaneously within 2 years without treatment — the immune system mounts an effective response over time. Watchful waiting is a reasonable strategy in this population, particularly for asymptomatic lesions. In adults, spontaneous resolution is less reliable.

Treatment options

Most plantar warts respond to consistent treatment, though they can be stubborn and require patience.

Topical Treatment

Over-the-counter salicylic acid applied daily after soaking the foot dissolves the wart tissue gradually; this is the standard first step and works well with consistent use over 6 to 12 weeks.

In-Office Treatment

Cryotherapy (freezing with liquid nitrogen) destroys the wart tissue and is performed in the office every few weeks until the wart clears; laser or chemical treatments are other options for resistant cases.

Surgical Excision

Surgical removal is reserved for large or stubborn warts that haven't responded to other treatments; recurrence is possible since the HPV virus can remain in the surrounding skin.

Frequently Asked Questions

Are plantar warts contagious?
Yes. HPV can spread through skin-to-skin contact or through contaminated surfaces. Avoiding walking barefoot in public areas and not sharing towels or footwear reduces transmission risk. Autoinoculation (spreading to adjacent skin by picking or shaving the lesion) is the most common route of spread.
Can I treat them at home?
Mild, asymptomatic warts — especially in children — can be treated with over-the-counter salicylic acid preparations. However, lesions that persist beyond 3 months, are painful, spreading, or atypical in appearance should be professionally evaluated.
Will they come back after treatment?
Recurrence is possible after any treatment modality, as local immunity may not eliminate the latent virus entirely. However, clearance rates after surgical excision or laser treatment are high.
How does a doctor treat plantar warts that have not responded to home remedies?
When over-the-counter salicylic acid preparations have not worked, physicians have several effective options. Cryotherapy (freezing with liquid nitrogen) destroys the wart tissue and is one of the most commonly used in-office treatments. Other options include prescription-strength topical agents, cantharidin application, laser treatment, or minor surgical excision for stubborn lesions. At MOS, your foot specialist will assess the size, number, and location of the warts and recommend the treatment approach most likely to achieve complete resolution with the least disruption to your daily activity.
How do I know if my foot lesion is a plantar wart and not something else?
Plantar warts typically appear on the bottom of the foot as thickened, rough-surfaced skin with small black dots (thrombosed capillaries) visible when the surface is pared down. They can be distinguished from calluses by their tendency to disrupt the normal skin lines (dermatoglyphics) that run through the lesion. Corns occur over bony prominences and have a translucent core rather than black dots. Occasionally, a skin lesion on the foot can represent something that requires further evaluation, so any foot lesion that bleeds, changes rapidly, or does not respond to treatment should be assessed by a medical professional.

Meet the specialists

Gary Feldman, DPM, FACFAS

Gary Feldman, DPM, FACFAS

Podiatry (Foot & Ankle Surgery)

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Medically reviewed by Gary Feldman, DPM, FACFAS, DPM, FACFAS
Last reviewed May 1, 2026

References

  1. Kwok CS, Gibbs S, Bennett C, Holland R, Abbott R. Topical treatments for cutaneous warts. Cochrane Database of Systematic Reviews. 2012;(9):CD001781. doi:10.1002/14651858.CD001781.pub3
  2. Bruggink SC, Gussekloo J, Berger MY, et al. Cryotherapy with liquid nitrogen versus salicylic acid application for cutaneous warts in primary care: randomized controlled trial. Canadian Medical Association Journal. 2010;182(15):1624–1630. doi:10.1503/cmaj.092270
  3. Sterling JC, Gibbs S, Haque Hussain SS, Mohd Mustapa MF, Handfield-Jones SE. British Association of Dermatologists' guidelines for the management of cutaneous warts 2014. British Journal of Dermatology. 2014;171(4):696–712. doi:10.1111/bjd.13310
  4. OrthoInfo — AAOS. Plantar Warts. Available at: https://orthoinfo.aaos.org/en/diseases--conditions/plantar-warts