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Home Health A to Z

Patient Basics: Warts

byHarvard Health
November 30, 2014
in Health A to Z
Reading Time: 4 mins read
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Originally published by Harvard Health.

What Is It?

Warts are small skin growths caused by the human papilloma virus (HPV), which infects the top layer of skin. There are more than 40 different types of HPV. The wart virus can be transmitted from one person to another either by direct contact, or indirectly when both people come in contact with a surface, such as a floor or desk.

People may come into contact with HPV by walking barefoot in public places, such as gyms and shower floors. HPV also can be transmitted in the same person from one spot on the body to another. It is easier for HPV to infect a person when the person’s skin is scratched or cut.

Warts can appear at any age but are more common in older children and are uncommon in the elderly. A wart’s appearance varies with its location and the type of virus that has caused it. For example, flat warts commonly appear on the face, neck, chest, forearms and legs. Most warts go away after a year or two, but some last for years or come back after going away.

Warts can itch or bleed. When warts are located in areas that are rubbed against clothing or bumped frequently, they can become irritated and the skin around them can become painful.

Symptoms

The two types of warts seen most often are common warts and plantar warts.

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  • Common warts have a rough surface and well-defined borders. They are round or irregular in shape and usually range from 2 millimeters to 10 millimeters wide (the size of a pencil eraser or smaller). Common warts are firm and can be light gray, flesh-colored, yellow, brown or gray-black. They occur most often near the fingernails and on the backs of the hands, but they also can appear on the elbows and knees. Common warts usually do not hurt.

Warts

  • Plantar warts appear on the bottom (sole) of the foot. They are flattened by the pressure of standing on them and can be dotted with tiny, clotted blood vessels that look like dark pinpoints. Plantar warts often are painful, especially when they’re on a weight-bearing part of the foot. Plantar warts may require vigorous, repeated treatment before they go away.

Warts1

Other types of warts include:

  • Genital warts appear on and near the genitals, as well as inside the vagina and on the cervix in women.

Warts2

  • Cervical warts appear on the cervix and sometimes develop into cervical cancer.
  • Mosaic warts appear on the feet. They are groups of many small, closely set plantar warts.
  • Filiform warts appear on the eyelids, face, neck or lips. They are long, narrow growths that usually grow straight out from the skin.
  • Flat warts appear on the face and along scratch marks. They are smooth, flat-topped, yellow-brown papules and are more common in children than in adults.
  • Pedunculated warts appear on the head and neck, scalp and beard and are shaped like cauliflower.

Diagnosis

A doctor usually can diagnose warts by looking at them. Sometimes, the doctor will have to take some tissue from a wart and analyze it under a microscope.

Expected Duration

Even without treatment, warts may disappear in months or years on their own. However, there is always a chance they will come back.

Prevention

It is difficult to prevent warts. You can reduce your chances of getting warts by avoiding skin contact with existing warts and with contaminated floors, such as those in locker rooms and around swimming pools.

Treatment

Most warts disappear within a year or two, even if they are not treated; however, without treatment warts may spread. Many people choose to have warts treated either because of minor pain or for cosmetic reasons. Treatment depends on the location of the wart, its type and size, a person’s age and health, and his or her willingness to follow through with repeated treatments.

You should talk to your doctor before trying to treat your warts. Over-the-counter liquids and patches containing salicylic acid can decrease the size of a wart, but they should not be used on the face or genitals. Your doctor may treat a wart by applying certain medications or acids, freezing it (cryotherapy) or surgically removing it.

When To Call a Professional

If you think you might have a wart, you should show it to your doctor at your next visit to make sure it is a wart and to discuss treatment.

Seek help if your wart causes pain, bleeds easily, spreads easily to other areas of the body or comes back, or if you want the wart removed for cosmetic reasons. You also should see your doctor if you develop genital warts, so they can be treated.

Prognosis

Warts usually disappear within a year or two and are little more than an inconvenience. But because they shed virus particles into the surrounding area, they are contagious and can cause new warts to appear nearby. In some people, warts may be a more chronic (long-lasting) problem. These people may have individual warts that won’t go away or they keep getting new warts. Warts that continue to persist or grow despite treatment should be examined by your doctor since some skin cancers can masquerade as warts.

Additional Info

American Academy of Dermatology
930 E. Woodfield Road
Schaumburg, IL 60173
Toll-Free: 1-866-503-7546
Fax: 1-847-240-1859
http://www.aad.org/

American Podiatric Medical Association (APMA)
9312 Old Georgetown Road
Bethesda, MD 20814
Phone: 301-571-9200
http://www.apma.org/

 

 

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