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Plantar Warts

Plantar warts are growths on the soles (plantar surface) of the feet. They are often mistaken for corns or calluses, but they are different because they are caused by a virus.

They grow in clusters and are usually flat, and can often be distinguished by numerous black dots visible on their surfaces. Although plantar warts are generally harmless, their location beneath the feet often renders them very painful. They also have a tendency to spread locally to other sites on the foot and elsewhere.

Plantar warts are caused by the human papillomavirus (HPV), which can be contracted by walking barefoot on unsanitary surfaces. Touching and scratching can cause the virus to spread.

Risk Factors:
A risk factor is something that increases your chance of getting a disease or condition. Risk factors for plantar warts include:
  • Exposing your feet to unsanitary surfaces
  • Age: plantar warts are more common in children and teens
  • Suppressed immune system due to:
    • AIDS
    • Lymphoma
    • Immunosuppressive drugs
  • Atopic dermatitis (eczema)
Symptoms include:
  • Hard, flat growths on the soles of the feet
  • Heaped-up calluses surrounding the wart surfaces
  • Pain in the area of the warts
The doctor will ask about your symptoms and medical history, and examine your feet. Although most warts are clearly distinguishable from other skin lesions, some doctors may wish to refer difficult cases to colleagues who specialize in foot problems (podiatrist) or skin disorders (dermatologist).

There are many over-the-counter products available to treat warts. These therapies often contain a mild acid and you can usually apply them when a wart first appears.

Another popular (and less expensive) treatment is using duct tape to cover a wart for a week at a time, coupled with weekly “sanding” of the wart with a pumice stone.

You should see a doctor:

  • For recurrent warts
  • For those that fail to respond to initial treatment
  • When over-the-counter therapies are not well-tolerated
  • When the diagnosis is unclear

After confirming the diagnosis of plantar warts, the doctor may use one or more of the following:

  • Cryotherapy–freezing the warts to kill the virus
  • Laser Treatment–using a laser to kill the virus and destroy wart tissue
  • Electrocautery Treatment–burning the wart
  • Surgical Removal–cutting out the warts (with anesthetic)
  • Immune Therapy–application of substances that stimulate the immune system’s response to the wart-causing virus

One interesting study from Iraq reported wart eradication using oral zinc sulfate. Whether this treatment would be helpful for plantar warts needs to be established by further studies. Zinc has had a long and controversial history as treatment for other viral infections, including the common cold.

The best ways to prevent plantar warts is to keep your feet from coming into contact with the virus that causes them. Ways to do this include:
  • Avoid walking barefoot, except on sandy beaches.
  • Wear plastic sandals when showering in public bathrooms.
  • Change your shoes and socks daily.
  • Keep your feet clean and dry.
  • Avoid direct contact with warts, either from other people or from other parts of the body.

In addition, periodically checking for warts on children’s feet may help prevent them from becoming larger and painful.

Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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