Warts affect roughly 10% of the global population at any given time, making them one of the most common skin conditions. Among school-aged children, that number climbs to 10% to 20%. They’re caused by human papillomavirus (HPV), which has dozens of strains that target skin cells, and nearly everyone will encounter at least one wart during their lifetime.
Who Gets Warts Most Often
Children and teenagers are by far the most affected group. Their immune systems are still learning to recognize and fight HPV, which is why prevalence peaks during school years. The good news is that childhood warts tend to clear up on their own: about half of primary schoolchildren with warts are wart-free within a year, and roughly two-thirds are clear within two years without any treatment.
Adults get warts too, but less frequently. By adulthood, most people’s immune systems have developed stronger defenses against the common HPV strains. That said, adults with weakened immune systems, whether from medications, chronic illness, or other factors, are significantly more likely to develop persistent warts that don’t resolve easily.
Common Warts vs. Plantar Warts vs. Genital Warts
Not all warts are the same, and different types show up in different places with different frequencies. Common warts, the rough, raised bumps that typically appear on hands and fingers, are the most widespread. Plantar warts grow on the soles of the feet and can be painful because body weight presses them inward. Flat warts are smaller and smoother, often appearing in clusters on the face, arms, or legs. All three types are caused by different strains of HPV, but they spread through the same basic mechanism: skin-to-skin contact or contact with contaminated surfaces.
Genital warts are a separate category caused by different HPV strains. Surveys of general adult populations show that anywhere from 0.4% to 12% of women report a lifetime history of genital warts, depending on the country. For men, lifetime rates range from about 0.3% to 8%. Annual incidence across both sexes runs roughly 160 to 289 new and recurrent cases per 100,000 people. HPV vaccination has begun reducing these numbers in countries with high uptake.
Where and How Warts Spread
Warts spread when HPV enters the skin through tiny breaks, cuts, or areas of friction. You can pick up the virus from direct contact with someone else’s wart or from surfaces the virus has been left on. Warm, moist environments are particularly hospitable. One study comparing communal shower users to people who only used locker rooms found a stark difference: 27% of those using shared showers had plantar warts, compared to just 1.25% of those who didn’t. Walking barefoot in gym showers, around pools, and in locker rooms meaningfully increases your risk.
Biting your nails or picking at hangnails also creates entry points for the virus on your fingers. People who handle raw meat professionally tend to get warts on their hands more often, likely due to the constant small cuts and wet conditions. Sharing towels, razors, or other personal items can transfer the virus as well, though surface transmission is less efficient than direct skin contact.
How Often Warts Go Away on Their Own
Many warts resolve without treatment, especially in children and young adults. The immune system eventually recognizes the virus and clears the infected skin cells. In children, roughly 50% of warts disappear within 12 months and about 67% within two years. Adults may take longer, and some warts persist for years without intervention.
The tendency to clear on its own is one reason doctors sometimes recommend a “watch and wait” approach, particularly for painless warts in children. But warts that are painful, spreading, or cosmetically bothersome often warrant treatment rather than patience.
Treatment Success and Recurrence Rates
The two most common treatments are salicylic acid (applied at home as a liquid or patch) and cryotherapy (freezing with liquid nitrogen at a clinic). For plantar warts, studies show these two approaches perform surprisingly similarly, with cure rates around 14% in some trials and much higher in others depending on the specific method and concentration used. Overall cure rates for cryotherapy across larger studies land around 76%, which sounds encouraging until you consider what happens next.
Recurrence is the real frustration with warts. Even after successful treatment, about 1 in 5 warts comes back, with the average recurrence happening around 8 months after the wart was cleared. This happens because treatment destroys the visible wart but doesn’t always eliminate every trace of the virus in surrounding skin. For this reason, it’s worth keeping an eye on the treated area for at least 8 months after a wart appears to be gone.
Multiple treatment sessions are common. Cryotherapy typically requires several visits spaced two to three weeks apart, and salicylic acid needs consistent daily application for weeks or months. Neither approach works 100% of the time, and stubborn warts sometimes require combining methods or trying alternative approaches.
Why Some People Get More Warts Than Others
Individual immune response plays a large role in who develops warts and how many they get. Some people are exposed to HPV repeatedly and never develop a single wart, while others seem to get them constantly. Genetics likely influence how effectively your immune system targets HPV in the skin, though the exact mechanisms aren’t fully understood.
Certain factors consistently increase risk: frequent skin damage or moisture exposure, immune-suppressing medications (common after organ transplants), and conditions like eczema that compromise the skin barrier. Children who already have one wart are more likely to develop additional ones, partly because they can spread the virus to other parts of their own body through scratching or touching, a process called autoinoculation. Covering warts with a bandage and avoiding picking at them reduces this self-spreading.