Plantar foot wart is the benign (non-cancerous) growth or foot wart, that occurs on the sole (plantar surface), heel, or ball of the foot. Pressure from standing and walking often causes them to grow into deep layers of the skin.

The human papillomavirus (HPV) causes several different types of foot warts, which are the most common type of skin infection. In some cases, the HPV virus dies within 1 or 2 years, and foot warts simply disappear. Podiatrist, or foot doctor, may recommend having plantar foot warts removed because they often are irritating and painful.

Plantar Wart Signs and Symptoms

Plantar warts usually are rough and spongy, and most are gray or brown with dark pinpoints (tiny capillaries that supply blood to the wart). Scraping a wart may cause it to bleed.
A plantar wart is similar in structure to an iceberg-the part on the surface of the skin is a small part of the entire anomaly. Often, the portion of the wart under the skin is at least twice as big as the part you can see.

Plantar warts may cause pain on the bottom of the foot. Patients often feel a “lump” on the bottom of the foot when standing, similar to having a stone in the shoe. In many cases, pressure from standing and walking prevents plantar warts from rising above the skin surface.
If left untreated, plantar warts can grow up to 1 inch in circumference and may spread into clusters (called mosaic warts). In severe cases, they cause a change in gait or posture that results in leg or back pain.

Plantar Wart Treatment

Over-the-counter medications contain chemicals that destroy skin cells (e.g., acid) and may damage healthy tissue surrounding the foot wart. Self-treatment for plantar warts using an over-the-counter preparation is not recommended.

In some cases, the doctor applies mild acid (e.g., salicylic acid, cantharidin, dichloroacetic acid) topically to treat plantar warts. This treatment, which often requires multiple applications over the course of several weeks, disintegrates viral cells and allows healthy skin cells to replace them.

Laser treatments (e.g., CO2 laser cautery) can be used to treat plantar warts. Laser treatment is performed in a podiatrist’s office or an outpatient surgery facility using local anesthesia. Lasers produce little scarring and are effective in most cases.

Cryotherapy involves freezing warts with a very cold solution (e.g., sodium nitride) that destroys the virus and causes the wart to turn black and fall off within a few days. This treatment is ineffective in some cases when the solution does not penetrate far enough to completely destroy the virus.

Surgical wart removal (called debridement) usually is not recommended to treat plantar warts because it can cause painful scarring.

Generally, this procedure is used for wart removal of several small warts in a limited area. Debridement is performed using anesthesia and can be used with acid to destroy the virus and prevent warts from re-growing.

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