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Warts are benign (not cancerous) skin growths that appear when a virus infects the top layer of the skin. Viruses that cause warts are called human papillomavirus (HPV). You are more likely to get one of these viruses if you cut or damage your skin in some way.
Wart viruses are contagious. Warts can spread by contact with the wart or something that touched the wart.
Warts are often skin-colored and feel rough, but they can be dark (brown or gray-black), flat, and smooth.
Image used with permission of the American Academy of Dermatology National Library of Dermatologic Teaching Slides.
Warts: Signs and symptoms
There are a few different types of warts. The type is determined by where it grows on the body and what it looks like. The following describes the signs (what a person sees) and symptoms (what a person feels) for some of the different types of warts.
(also called vurruca vulgaris)
If you see a wart on your child's face, check your child's hands for warts. The virus that causes warts can spread from the hands to the face through touch or nail biting.
Common warts have these traits:
- Grow most often on the fingers, around the nails, and on the backs of the hands.
- Are more common where skin was broken, such as from biting fingernails or picking at hangnails.
- Can have black dots that look like seeds (often called "seed" warts).
- Most often feel like rough bumps.
(also called plantar warts)
Plantar warts have these traits:
- Grow most often on the soles (plantar surface) of the feet.
- Can grow in clusters (mosaic warts).
- Often are flat or grow inward (walking creates pressure, which causes the warts to grow inward).
- Can hurt, feels like you have pebbles in your shoe.
- Can have black dots.
Flat warts have these traits:
- Can occur anywhere. Children usually get them on the face. Men get these most often in the beard area, and women tend to get them on their legs.
- Are smaller and smoother than other warts.
- Tend to grow in large numbers — 20 to 100 at a time.
Filiform warts have these traits:
- Looks like long threads or thin fingers that stick out.
- Often grows on the face: around the mouth, eyes, and nose.
- Often grow quickly.
HIV weakens the immune system, so the body often cannot fight the virus that causes the warts.
Images used with permission of the American Academy of Dermatology National Library of Dermatologic Teaching Slides.
Warts: Who gets and causes
Who gets warts?Anyone can get warts. Some people are more prone to getting a wart virus (HPV) than others. These people are:
- Children and teens.
- People who bite their nails or pick at hangnails.
- People with a weakened immune system (the body’s defense system).
In children, warts often go away without treatment. A dermatologist should treat warts that hurt, bother the child, or quickly multiply.
What causes warts?
Viruses called human papillomavirus (HPV) cause warts. It is easier to catch a virus that causes warts when you have a cut or scrape on your skin. This explains why so many children get warts. Warts also are more common on parts of the body that people shave such as the beard area in men and the legs in women. You can spread warts from one place on your body to another.
Warts can spread from person to person. You can get warts from touching a wart on someone’s body. Some people get a wart after touching something that another person’s wart touched, such as a towel. It often takes a few months for warts to grow large enough to see.
Warts: Diagnosis and treatment
How do dermatologists diagnose warts?
A dermatologist can tell whether you have a wart by looking at it. In rare cases, a dermatologist may need to perform a skin biopsy to be certain. If a dermatologist needs to perform a biopsy, the doctor will remove the wart and send it to a lab. At the lab, a small piece of the wart will be looked at under a microscope.
A biopsy is a safe and quick procedure for a dermatologist to perform. It should not cause any anxiety.
How do dermatologists treat warts?
Warts often go away without treatment. This is especially true when children get warts. In adults, warts may not disappear as easily or as quickly as they do in children. Although most warts are harmless, dermatologists do treat them.
You should see a dermatologist if you cannot get rid of the warts, the warts hurt, or you have many warts. Dermatologists have many treatments for warts. The treatment used depends on the patient’s age and health as well as the type of wart.
A dermatologist may use one of the following treatments:
- Cantharidin: A dermatologist may treat a wart in the office by "painting" it with cantharidin. Cantharidin causes a blister to form under the wart. In a week or so, you can return to the office and the dermatologist will clip away the dead wart.
- Cryotherapy: For common warts in adults and older children, cryotherapy (freezing) is the most common treatment. This treatment is not too painful. It can cause dark spots in people who have dark skin. It is common to need repeat treatments.
- Electrosurgery and curettage: Electrosurgery (burning) is a good treatment for common warts, filiform warts, and foot warts. Curettage involves scraping off (curetting) the wart with a sharp knife or small, spoon-shaped tool. These two procedures often are used together. The dermatologist may remove the wart by scraping it off before or after electrosurgery.
- Excision: The doctor may cut out the wart (excision).
If the warts are hard-to-treat, the dermatologist may use one of the following treatments:
- Laser treatment: Laser treatment is an option, mainly for warts that have not responded to other therapies. Before laser treatment, the dermatologist may numb the wart with an anesthetic injection (shot).
- Chemical peels: When flat warts appear, there are usually many warts. Because so many warts appear, dermatologists often prescribe "peeling" methods to treat these warts. This means, you will apply a peeling medicine at home every day. Peeling medicines include salicylic acid (stronger than you can buy at the store), tretinoin, and glycolic acid.
- Bleomycin: The dermatologist may inject each wart with an anti-cancer medicine, bleomycin. The shots may hurt. They can have other side effects, such as nail loss if given in the fingers.
- Immunotherapy: This treatment uses the patient’s own immune system to fight the warts. This treatment is used when the warts remain despite other treatments. One type of immunotherapy involves applying a chemical, such as diphencyprone (DCP), to the warts. A mild allergic reaction occurs around the treated warts. This reaction may cause the warts to go away.
Another type of immunotherapy involves getting shots of interferon. The shots can boost the body’s immune system, which gives the body the ability to fight the virus.
There is no cure for the wart virus. This means that warts can return at the same site or appear in a new spot.
Sometimes, it seems that new warts appear as fast as old ones go away. This happens when the old warts shed virus cells into the skin before the warts are treated. This allows new warts to grow around the first warts. The best way to prevent this is to have your dermatologist treat new warts as soon as they appear.
Warts: Tips for managing
Warts can often be treated at home. The following explains when you can safely treat warts at home and when you should see a dermatologist.
You can get some wart remedies without a prescription and treat the warts yourself. This may be enough to get rid of the warts. The only problem with self-treatment is that you might mistake another kind of skin growth for a wart. Some skin cancers look like warts.
You should see a dermatologist when you have:
- A suspicion that the growth is not a wart.
- A wart on your face or genitals.
- Many warts.
- Warts that hurt, itch, burn, or bleed.
- A weakened immune system.
- Diabetes. Never try to remove any wart on your foot if you have diabetes. If you cut or burn your skin, it could cause lasting damage to the nerves in your feet.
You can use the following at home:
- Salicylic acid: You can treat warts at home by applying salicylic acid. This medicine is available without a prescription. It comes in different forms — a gel, liquid, or plaster (pad). You should apply salicylic acid to the wart every day. Before applying the salicylic acid, be sure to soak the wart in warm water.
Salicylic acid is rarely painful. If the wart or the skin around the wart starts to feel sore, you should stop treatment for a short time. It can take many weeks of treatment to have good results — even when you do not stop treatment.
- Other home remedies: Some home remedies are harmless, such as covering warts with duct tape. Changing the tape every few days might peel away layers of the wart. Studies conflict, though, on whether duct tape really gets rid of warts.
Many people think certain folk remedies and hypnosis get rid of warts. Since warts may go away without treatment, it's hard to know whether a folk remedy worked or the warts just went away.
Ask your dermatologist if you are unsure about the best way to treat a wart.
To prevent warts from spreading, dermatologists recommend the following:
- Do not pick or scratch at warts.
- Wear flip-flops or pool shoes in public showers, locker rooms, and pool areas.
- Do not touch someone’s wart.
- Keep foot warts dry, as moisture tends to allow warts to spread.