A common wart is a small, rough skin growth caused by human papillomavirus (HPV) infecting the outer layer of skin. These warts are harmless, affect roughly 3.3% of children in the U.S., and in most people with healthy immune systems, they disappear on their own within two to four years without any treatment.
What Causes Common Warts
Common warts are caused by specific strains of HPV, most often types 2 and 4, though types 1, 3, 27, 29, and 57 can also be responsible. These are not the same strains linked to genital warts or cervical cancer. The virus enters through tiny breaks in the skin, even microscopic ones you can’t see, and infects the deepest layer of skin cells. Once inside, it forces those cells to multiply faster than normal, pushing the outer skin layer upward into a thickened, hardened bump.
HPV is surprisingly durable. It resists heat and drying, and can survive on surfaces like gym equipment, towels, and shared objects for an unknown but meaningful length of time. You can pick it up through direct skin contact with someone who has a wart, or by touching a contaminated surface. Wet, soft, or damaged skin is especially vulnerable because it creates easier entry points for the virus.
What a Common Wart Looks and Feels Like
Common warts are firm, dome-shaped bumps with an irregular, rough surface that’s sometimes described as carpet-like. On the hands and other areas that get a lot of friction, the hard, nodular texture is the most obvious feature. In moist or covered areas, warts tend to be softer and more raised on a narrow base.
One telltale sign is the pattern of tiny dark dots visible on the surface. These are small blood vessels that have clotted inside the wart. Another useful identifier: warts interrupt the normal fingerprint lines on your hands and feet. If you look closely and the skin lines flow right through the bump, it’s more likely a callus or corn. If the lines stop at the edges of the growth, it’s probably a wart.
Warts can appear singly or in clusters. They’re usually painless unless they’re in a spot that gets constant pressure, like the bottom of a foot. Related but visually distinct types include flat warts, which are smooth and only 2 to 4 millimeters across, and filiform warts, which have finger-like projections and tend to grow quickly, often on the face.
Where They Typically Appear
The hands are the most common location, particularly the fingers, knuckles, and the skin around fingernails. This makes sense given that hands are constantly exposed to minor cuts, hangnails, and contact with surfaces. Areas of high wear and tear are at the greatest risk because they’re the most likely to have small skin breaks the virus can exploit.
Children tend to develop warts more frequently than adults. Prevalence rises steadily from ages one through eight, peaks around ages nine to ten, and then levels off through the teenage years. Kids are more likely to have cuts, scrapes, and the habit of picking at skin, all of which create opportunities for infection.
How Warts Spread to Other People and Other Body Parts
Warts spread two ways: to other people, and to other parts of your own body. The second type, called autoinoculation, is extremely common and often the reason a single wart turns into several. Nail biting, picking at cuticles, and picking at existing warts are some of the most effective ways to spread the virus across your own skin. Shaving over or near a wart can drag infected cells along the blade and seed new warts in the shaved area.
Certain activities raise your risk of catching warts from others. Grappling sports like wrestling and jiu-jitsu involve prolonged skin contact. Sharing gym equipment, especially free weights, creates a transmission point. Walking barefoot in dance studios, fitness centers, or around pools exposes the feet to the virus on damp surfaces. Sweaty or wet skin is at higher risk because moisture softens the skin and creates the micro-cracks HPV needs to get in.
To limit spread, avoid touching or picking at warts, don’t share towels or personal items, and wear footwear in shared wet areas. If you have a wart on your hand, covering it with a bandage during sports or gym sessions reduces the chance of passing it along.
How Long They Last Without Treatment
Most common warts in people with healthy immune systems resolve on their own within two to four years. The immune system eventually recognizes and clears the virus, and the wart shrinks and disappears. Some warts, however, linger for much longer, and there’s no reliable way to predict which ones will go away quickly and which will stick around.
This natural timeline is why treatment is optional for many people. The main reasons to treat are cosmetic concerns, discomfort, rapid spreading, or simply not wanting to wait years for resolution.
Over-the-Counter Treatment
The most widely used home treatment is salicylic acid, available in liquid, gel, and adhesive pad forms. The 17% concentration is the most common, though no single preparation has been shown to work better than another. It works by gradually dissolving the layers of thickened skin that make up the wart, peeling it away over time.
This is not a fast process. You apply salicylic acid daily, typically after soaking the wart in warm water and filing down dead skin with a pumice stone or emery board. Treatment takes up to 12 weeks of consistent use. In clinical trials, this approach cleared warts about 73% of the time after six to twelve weeks, compared to 48% with a placebo. That placebo number reflects the fact that many warts are already resolving on their own during the treatment window.
The key to success with salicylic acid is patience and consistency. Missing applications or giving up after a few weeks is the most common reason it fails.
Professional Removal Options
The most common in-office treatment is cryotherapy, where liquid nitrogen is applied to freeze the wart. Freezing destroys the wart tissue directly and triggers an immune response that helps the body target the virus. A typical session takes only seconds, but the treated area will blister and may be sore for several days afterward. Multiple sessions spaced a few weeks apart are usually needed.
Clearance rates for cryotherapy range from 39% to 84% at three months, a wide range that reflects differences in technique, number of sessions, and wart location. Interestingly, a large trial of 240 patients found no significant difference in clearance between repeated cryotherapy and daily salicylic acid at six months (34% vs. 31%). Patient satisfaction was higher with cryotherapy, likely because it requires less daily effort.
Other professional options include electrosurgery (burning the wart with an electrical current) and physical removal by scraping. These are generally reserved for warts that haven’t responded to freezing or salicylic acid, and they carry a slightly higher risk of scarring.
How to Tell a Wart From Similar Growths
Several skin conditions look similar to common warts, and the distinction matters because they’re treated differently. Corns and calluses are the most frequent source of confusion, especially on the hands and feet. The simplest test is visual: warts disrupt your natural skin lines, while corns and calluses preserve them. If you pare down the surface of a wart, you’ll see the characteristic pattern of tiny dark blood vessel dots. Corns and calluses lack these.
Molluscum contagiosum is another viral skin condition common in children, but it produces smooth, dome-shaped bumps with a small dimple in the center, quite different from the rough texture of a common wart. Skin tags are soft, hang from a thin stalk, and aren’t caused by a virus. If a growth is changing color, bleeding spontaneously, or growing rapidly in an unusual way, having it evaluated by a dermatologist is worthwhile to rule out other conditions.