Merck Manual

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The Manual's Editorial Staff

Reviewed/Revised Jan 2024
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What are warts?

Warts are small skin growths caused by a virus called human papillomavirus (HPV). There are many different types of HPV. Warts can grow on any part of your skin, and they may also spread to other people.

What causes warts?

Warts are caused by a type of virus called HPV. There are more than 100 types of HPV. You can get a wart by touching another person's wart, including by having sex with someone who has a wart on the penis, vagina, or rectum. Oral sex can cause an HPV infection in your mouth or throat.

Children and young adults are more likely to get warts. Risk is also higher in people with a weakened immune system Overview of the Immune System The immune system is your body's defense system. It helps protect you from illness and infection. The immune system's job is to attack things that don’t belong in your body, including: Germs... read more , such as those with HIV/AIDS or those who've had an organ transplant.

What are the specific types of warts?

Common warts:

  • Are small, firm growths with a rough surface and may be gray, yellow, brown, or black

  • Appear on body parts that are often injured, such as your knees, face, fingers, or elbows

  • May spread to nearby skin

Plantar and palmar warts:

  • Are hard, flat, and rough and may be gray or brown with a small black center

  • Palmar warts appear on the palm of your hand

  • Plantar warts usually appear on the sole of your foot but may appear as raised growths on the top of your foot or on your toes

  • Plantar warts are often tender and may be painful when you stand or walk

Mosaic warts are groups of smaller plantar or palmar warts that join together.

Periungual warts:

  • Are thick growths around your nails that may have the texture of cauliflower

  • May cause problems such as infections in the skin around your nail

  • Usually happen to people who bite their nails or often have wet hands, such as dishwashers

Filiform warts:

  • Are long, narrow, small growths that usually appear on your eyelids, face, neck, or lips

  • Are usually easy to treat

Flat warts:

  • Are more common among children and young adults

  • Usually appear in groups as smooth, flat-topped, yellow-brown, pink, or flesh-colored spots

  • Often appear on your face, tops of your hands, along scratch marks, or where you shave—such as around a man’s beard or on a woman’s legs

  • May be hard to treat

How can doctors tell if I have warts?

Doctors recognize warts by the way they look. If you have a skin growth that doctors don’t recognize, they may remove it to look at under a microscope (biopsy).

How do doctors treat warts?

Many warts disappear without treatment in a year or two, especially common warts. If you have genital warts Genital Warts HPV is a virus that causes warts. There are many types of HPV. Some types of HPV cause warts on your skin Other types of HPV cause warts on your genitals (genital warts) Some of the types of... read more , doctors will treat them with medical creams, chemicals, or sometimes surgery. Doctors will remove most kinds of warts using chemicals, freezing, burning them off with a laser, or cutting them off. The treatment depends on the kind of wart, where it is on your body, and how big it is.

Any kind of wart may come back after it goes away or is removed, especially a plantar wart.

Wart removal using chemical creams and liquids:

  • Doctors usually use creams or liquids that contain salicylic acid, trichloroacetic acid, or other chemicals that make warts disappear or peel off

  • Some chemicals can be applied yourself at home following directions carefully so you don’t burn your skin

  • You or your doctor need to scrape dead tissue off the wart before each treatment

  • To get rid of a wart, you or your doctor will probably have to treat it many times during several weeks to months

Wart removal using freezing (cryotherapy):

  • Doctors usually use freezing to treat plantar warts, filiform warts, and warts under fingernails

  • Doctors may numb the area when treating warts on children

  • You’ll usually need to get many treatments one month apart, especially if your wart is large

Wart removal using burning and cutting:

  • Doctors use a laser or electrical current to burn warts off

  • These treatments work well but are more painful and usually leave a scar

Drugs Mentioned In This Article

Generic Name Select Brand Names
Akurza , Aliclen, Bensal HP, Clear Away, Clear Away Liquid, Clear Away One Step, Clear Away Plantar, Clearasil Rapid Rescue Deep Treatment, Compound W, Compound W Total Care Wart & Skin, Corn/Callus Remover, Curad Mediplast, DermacinRx Atrix, DermacinRx Salicate, Dermarest Psoriasis Moisturizer, Dermarest Psoriasis Overnight Treatment, Dermarest Psoriasis Scalp Treatment, Dermarest Psoriasis Shampoo plus Conditioner, Dermarest Psoriasis Skin Treatment, Dr. Scholl's Callus Removers, Dr. Scholl's Corn Removers, Dr. Scholl's Extra Thick Callus Remover, Dr. Scholl's One Step Callus Remover, Dr. Scholl's One Step Corn Removers, Dr. Scholl's Ultra, Dr.Scholl's Dual Action FREEZE AWAY, Dr.Scholl's Duragel, DuoFilm Wart Remover, Freezone, Gold Bond Psoriasis Relief, Gordofilm , Hydrisalic, Ionil, Ionil Plus, Keralyt, Keralyt 5, Keralyt Scalp Complete, MOSCO Callus & Corn Remover, MOSCO One Step Corn Remover, Neutrogena Acne Wash, Neutrogena T/Sal Scalp, Occlusal-HP, P&S, RE SA , SalAC, Salactic Film , Salacyn, Salex, Salimez, Salimez Forte, Salisol , Salisol Forte , Salitech, Salitech Forte, Salitop , Salkera, Salvax, Salycim, Scalpicin 2 in 1 Anti-Dandruff, Selsun Blue, Thera-Sal , Trans-Ver-Sal, UltraSal-ER, VIRASAL, Wart-Off, XALIX
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