In short. Warts are common, flat or plantar skin growths driven by human papillomavirus infecting the outer skin layer. They are contagious by contact, often self-limiting within months to a couple of years, but face, pain, spreading, or immunosuppression are reasons to treat rather than wait; established warts usually need clinic treatment, not home acids.
Key points
- Warts are HPV-driven growths of the skin's surface layer.
- Many settle within months to a couple of years, especially in children.
- Face, pain, spread, or immunosuppression are reasons to treat rather than wait.
- Home acids and filing fail because they cannot reach the virus.
- Established warts need clinic destruction or immune-directed treatment.
What are common, flat and plantar warts?
Warts are growths driven by human papillomavirus (HPV) infecting the skin's surface layer. Common warts sit on fingers and knuckles with a rough, cauliflower-like surface. Flat warts gather in clusters on the face and the backs of the hands. Plantar warts are pressed into the soles of the feet by body weight, often painful with walking. They are contagious by contact and by contaminated floors, most often affect children and young adults, and frequently resolve on their own within months to a couple of years. Face, pain, spreading, or immunosuppression are reasons to treat rather than wait.
Why do warts resist home treatment?
HPV hides in the top skin layer beneath its own thickened cap of keratin. Picking, filing and over-the-counter acids cannot reach the virus, and the trauma of trying often spreads it further across the skin. Plantar warts add a second problem: pressed flat by body weight into the thick sole skin, they mimic corns and calluses and survive everything short of clinic-grade destruction.
How is a wart told apart from a corn or callus?
A corn has a hard central core, and skin lines run through it. A callus is diffuse thickening without the black dots (thrombosed capillaries) that mark a plantar wart. Molluscum are pearly bumps with a central dimple. On genital skin, growths need a different diagnostic conversation entirely.
| Plantar wart | Corn or callus | |
|---|---|---|
| Surface | Rough and grainy | Hard, smooth thickening |
| Skin lines | Do not cross the lesion | Run through it |
| Black dots | Often visible after paring | Absent |
| Central core | No hard core | Hard core in a corn |
| Confirmation | Paring and dermatoscopy | Paring shows the lines continuing |
Any wart-like lesion in an adult that is pigmented, irregular, bleeding or treatment-resistant is examined with a dermatoscope rather than destroyed, because what looks like a wart is occasionally something else.
Assessment: count, sites and immune status
Usually clinical. Paring the surface of a plantar wart reveals the characteristic black dots; dermatoscopy confirms. The count, sites, duration, immune status (including diabetes and medications) and previous treatments shape the plan. Spread across a shaving area on the face or beard region in men is a clue that shaving is propagating flat warts.
Clinic treatment: destruction and immune activation
The ladder runs from destruction to immune activation, chosen by site, number and previous treatment.
- Destructive: cryotherapy (repeated freezing at careful intervals), curettage and electrocautery for established common warts, and laser for selected resistant cases.
- Chemical: clinic-strength keratolytics and caustics applied with precision, with home routines between visits.
- Immune-directed: topical immunotherapy and intralesional injections for multiple or recurrent warts; alerting the immune system is often what stubborn cases need.
- Plantar specifics: paring plus cryotherapy or laser, with off-loading of pressure; several sessions are the norm.
What not to do at home
Do not cut, rip, or share files and clippers on warts, because trauma spreads them. Do not use corn plasters on plantar warts: they burn surrounding skin without reaching the wart. Diabetics and anyone with poor circulation should never self-treat foot lesions. And any wart-like lesion that fails treatment is re-diagnosed, not re-treated blindly.
When should a wart be seen by a dermatologist?
- A “wart” is pigmented, irregular, bleeding, or in an adult without clear reason: examined before destroyed.
- Warts are multiplying, on the face or genitals, or the patient is immunosuppressed or diabetic.
- Foot pain suggests a plantar wart mimicking a corn: correct diagnosis saves months of wrong treatment.
Sources
Internal links
Frequently asked questions
Do warts go away without treatment?
They frequently resolve on their own within months to a couple of years, especially in children and young adults. Face, pain, spreading, or a suppressed immune system are reasons to treat rather than wait for the wart to settle by itself.
Are warts contagious?
Yes. They are spread by contact and by contaminated floors. Picking, filing and over-the-counter acids fail on established warts because the treatment cannot reach the virus, and the trauma of trying often spreads it further across the skin.
When is a wart not a wart?
Any wart-like lesion in an adult that is pigmented, irregular, bleeding or treatment-resistant is examined with a dermatoscope rather than destroyed, because what looks like a wart is occasionally something else. On the sole, corns show skin lines running through them.
Risks & Limitations
- Most chronic skin disease is managed rather than cured, and relapse is expected.
- Treatments typically need 8–12 weeks before response can be judged fairly.
- Topical treatment can cause irritation, dryness, peeling and photosensitivity.
- Systemic therapy may require blood monitoring and carries organ, metabolic and pregnancy risks.
- Isotretinoin in particular requires strict monitoring and pregnancy prevention.
- Pigment change is often slow and may be incomplete.
- No treatment works for everyone, and response cannot be predicted with certainty.
When to Seek Care
- A mole or lesion that changes in size, shape or colour, or starts to bleed, itch or crust.
- Fever with a widespread rash, blistering, or rash involving the eyes, mouth or genitals — seek emergency care.
- Rapidly spreading redness, swelling or pain in the skin.
- Facial swelling or difficulty breathing — possible severe reaction; seek emergency care immediately.
- New or worsening symptoms while taking a monitored medication.
References & Further Reading
- American Academy of Dermatology (AAD) — public and clinical guidance
- World Health Organization (WHO) — skin and infectious disease resources
- Chinese Medical Association, Dermatology Branch — clinical guidance
- Cochrane Library — systematic reviews in 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.