In short. What causes warts, how human papillomavirus spreads, why treatments are not guaranteed, and why warts so often come back.
Key points
- Do not pick, scratch or shave over a wart.
- Keep warts covered with a plaster when swimming or using shared equipment.
- Wear footwear in shared showers and changing areas.
Warts are benign growths of the top layer of skin caused by human papillomavirus. The virus infects the skin through small breaks, often too small to notice, and prompts the skin cells to multiply. Warts are common, harmless in themselves, and — this is the part most people are not told clearly — genuinely difficult to eradicate.
How HPV spreads
More than a hundred types of HPV exist. The types that cause common skin warts are different from those that cause genital infection and from those linked to cervical and other cancers. Skin warts spread by direct contact and via shed skin scales on floors, mats and shared surfaces; that is why they are common in swimming pools, gyms, shared bathrooms and among children at school. A person can spread the virus to another part of their own body by scratching or picking, which is why warts often appear in lines where the skin has been scratched.
Why they recur
Treatment destroys the visible wart, but the virus lives in the skin around and beneath it, and it is often present in skin that looks entirely normal. That is why warts return after apparently successful treatment, usually within weeks to months, and why the recurrence rate after any single treatment is high. Immunity to HPV develops slowly and varies between people, which is why some people clear warts spontaneously while others have them for years, and why those who are immunosuppressed often have many and stubborn lesions.
What treatment can and cannot do
No treatment is guaranteed, and all of them aim at removal rather than cure. Options include topical preparations applied at home over weeks, and clinic treatments such as freezing, curettage, and other destructive methods. Home treatment is slow and needs patience; clinic treatment works faster but may need several sessions and can be painful, and it may leave a small scar or a change in pigment. Combining methods sometimes helps. Even with ideal treatment, a proportion of warts recur, and this is a property of the virus, not a failure of the clinician or the patient.
Reducing spread
Do not pick, scratch or shave over a wart. Keep warts covered with a plaster when swimming or using shared equipment. Wear footwear in shared showers and changing areas. Do not share towels, socks, nail clippers or files. Treat warts before they become numerous, and check the feet, since warts there are easily missed.
Get a lesion checked if
- A growth changes colour, bleeds, ulcerates or becomes painful, or it is not clearly a wart.
- You have diabetes, poor circulation or suppressed immunity, or the wart is on the face or genitals.
- A wart spreads rapidly or new ones keep appearing despite treatment.
Frequently asked questions
Why do warts come back after apparently successful treatment?
Treatment destroys the visible wart, but the virus lives in the skin around and beneath it and is often present in skin that looks entirely normal. That is why warts return within weeks to months and why the recurrence rate after any single treatment is high.
Are the HPV types that cause skin warts the same as those linked to cancer?
No. More than a hundred types of HPV exist, and the types that cause common skin warts are different from those that cause genital infection and from those linked to cervical and other cancers.
Can warts spread to other parts of your own body?
Yes. A person can spread the virus to another part of their own body by scratching or picking, which is why warts often appear in lines where the skin has been scratched. Shed skin scales on floors and shared surfaces spread them to other people.
Risks & Limitations
- Treatment fails if the diagnosis is wrong, or if the course is shorter than the infection requires.
- Relapse after apparent cure is common — reinfection from feet, nails, pets, household contacts or shared floors.
- Oral antifungals interact with many common medicines and need liver and blood monitoring.
- Skin colour change and scarring can follow infection, and may take months to fade or be permanent.
- Warts recur after any treatment, and no single treatment is guaranteed to clear them.
- Antiviral treatment for herpes works best started early, and it does not remove the virus.
- Nail fungus treatment takes months, and a proportion of people relapse afterwards.
When to Seek Care
- Fever with a spreading rash, or pain far worse than the skin appears — seek emergency care the same day.
- Rapidly spreading redness, swelling, dusky or blistered skin, or numbness over the area.
- Shingles near the eye or on the tip of the nose, or eye pain, redness or blurred vision.
- Blistering skin, or a rash involving the eyes, mouth or genitals.
- Any skin infection with fever in someone who is immunocompromised, diabetic, or taking steroids or chemotherapy.
References & Further Reading
- American Academy of Dermatology (AAD) — public and clinical guidance
- World Health Organization (WHO) — skin and infectious disease resources
- Centers for Disease Control and Prevention (CDC) — infection prevention and treatment guidance
- Chinese Medical Association, Dermatology Branch — clinical guidance
- Cochrane Library — systematic reviews in skin infection and dermatology
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.