Warts: Types, Treatment Options, and When They Need Medical Attention
Medically reviewed by Dr. Celina Kazumi Iwasa, MD, Board-Certified Dermatologist · Last updated June 2026
Warts are one of the most common skin growths — and one of the most stubbornly persistent. Caused by human papillomavirus (HPV), warts affect an estimated 10% of the general population and up to 20% of school-age children. They're benign, not dangerous, and most will eventually resolve on their own as the immune system learns to fight the virus. The problem? 'Eventually' can mean months to years, and in the meantime, warts can spread, cause pain (especially plantar warts), and cause significant cosmetic distress.
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Quick Answer
Warts are common, benign skin growths caused by the human papillomavirus (HPV). They frequently appear on the hands and feet as rough, raised bumps that may contain tiny black dots. The virus enters the skin through tiny cuts or breaks and triggers an overgrowth of skin cells. While warts are harmless and most will naturally disappear within two years as your immune system fights the virus, they are contagious. Over-the-counter treatments like salicylic acid can speed up the healing process, though persistent warts may require professional treatment from a doctor.
Symptoms
- Rough, raised growth on skin
- Flesh-colored, white, or pink growth
- May have black dots (clotted blood vessels)
- Plantar warts on feet may have thick callus
- Flat warts are smooth and flat-topped
- Cluster of warts called mosaic warts
Severity & Progression
What Causes Warts
Warts are caused by human papillomavirus (HPV), a double-stranded DNA virus with over 200 identified types. Different HPV types have preferences for different body sites: HPV-1 causes deep plantar warts, HPV-2 and -4 cause common warts, HPV-3 and -10 cause flat warts, and HPV-6 and -11 cause most genital warts.
The virus infects keratinocytes in the epidermis by entering through tiny breaks in the skin. It hijacks the cell's DNA replication machinery to produce new viral particles while stimulating the infected cells to proliferate, creating the characteristic thickened, rough growth. HPV has evolved sophisticated mechanisms to evade the immune system — it stays within the epidermis (which has limited immune surveillance), downregulates the presentation of viral antigens, and suppresses local interferon production.
Incubation period ranges from 1–6 months. Transmission occurs through direct skin contact with a wart, contact with surfaces contaminated by the virus (swimming pool decks, shower floors, gym equipment), and autoinoculation (spreading from one body site to another through scratching or shaving). Moist, macerated, or damaged skin is more susceptible.
Immune status is the single most important factor determining wart persistence and severity. Immunosuppressed patients (organ transplant recipients, HIV patients) develop more numerous, more resistant, and potentially more dangerous warts.
How Warts Differs from Similar Conditions
Several conditions can look similar. Here's how to tell them apart — though a healthcare professional can provide a definitive diagnosis.
| Condition | Key Difference from Warts |
|---|---|
| Seborrheic Keratosis | Waxy, 'stuck-on' appearance. Very common in adults over 40. Not caused by HPV. Not contagious. Surface has a characteristic 'cerebriform' (brain-like) pattern. |
| Molluscum Contagiosum | Smooth, dome-shaped, pearly papules with a central dimple (umbilication). Caused by a poxvirus, not HPV. More common in children and immunosuppressed adults. |
| Corn/Callus | Hard, thickened skin over a pressure point (toe, ball of foot). Smooth surface preserving skin lines. No black dots (thrombosed capillaries). Caused by friction/pressure, not a virus. |
| Squamous Cell Carcinoma | Rough, scaly or crusting nodule that may bleed. Occurs on sun-damaged skin. Grows persistently. Any wart that doesn't respond to treatment, is rapidly growing, or appears in an older adult should be biopsied to exclude SCC. |
| Skin Tags | Soft, flesh-coloured or brown pedunculated growths. Found in skin folds (neck, armpits, groin). Not caused by HPV. Not contagious. |
Treatment: What Actually Works
Expectant management (no treatment) is a legitimate option — two-thirds of warts in children resolve spontaneously within 2 years. For adults, spontaneous resolution is slower and less reliable.
Salicylic acid (17–40%) is the most evidence-based first-line treatment. It works by chemically dissolving the infected keratin layer by layer. For best results: soak the wart in warm water for 5 minutes, pare down dead tissue with a disposable emery board or pumice stone, apply salicylic acid, and cover with tape. Repeat daily for 12 weeks. Cure rate: approximately 75% with consistent use.
Cryotherapy with liquid nitrogen, performed by a clinician, freezes and destroys the wart tissue. Typically requires 2–4 treatments at 2–3 week intervals. Cure rate: 50–70%. Can be painful and may cause blistering. Best for common warts on non-sensitive areas.
Combination therapy (salicylic acid between cryotherapy sessions) improves cure rates to 85–90%.
Other treatments for resistant warts: topical immunotherapy (diphencyprone — stimulates a local immune response), intralesional bleomycin (injected into the wart — very effective but painful), topical 5-fluorouracil, imiquimod cream (immune modifier — particularly useful for flat warts and genital warts), and laser treatment (pulsed dye laser destroys the wart's blood supply).
Plantar warts (verrucae) on weight-bearing areas can be particularly painful and treatment-resistant. Aggressive salicylic acid therapy, needling (puncturing the wart repeatedly under local anaesthetic to stimulate immune recognition), and Swift microwave therapy are effective options.
Important: Do NOT attempt to cut, burn, or rip off a wart yourself — this can cause scarring, infection, and viral spread to adjacent skin.
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When Warts Is Actually Something Else
In adults over 50, any persistent, growing 'wart' — especially on sun-exposed skin — should be biopsied to exclude squamous cell carcinoma, which can closely resemble a wart. A 'wart' on the sole of the foot that's tender when squeezed laterally (rather than with direct pressure) may actually be a foreign-body granuloma or even a plantar fibroma. Molluscum contagiosum has a smooth, pearly surface with a central dimple — quite different from the rough, 'cauliflower' surface of common warts.
Warts Across Skin Types and Hair Types
In darker skin, warts may appear skin-coloured, grey-brown, or hyperpigmented. Flat warts, which can be very subtle in lighter skin, are often easier to see in darker skin because they tend to become hyperpigmented. However, treatment-related hyperpigmentation or hypopigmentation is a significant concern: cryotherapy, in particular, can cause prolonged hypopigmentation in darker-skinned patients. For this reason, salicylic acid or topical immunotherapy may be preferred over cryotherapy in patients with darker skin to minimise pigmentary complications.
Self-Care Tips
- Don't pick or scratch warts (spreads them)
- Wash hands after touching warts
- Don't share towels, razors, or personal items
- Wear sandals in communal showers/pools
- File down thick warts with disposable file
- Be patient - warts often take months to clear
When to See a Doctor
If warts are painful, spreading rapidly, on the face or genitals, if you're diabetic or immunocompromised, or if home treatment hasn't worked after 2-3 months
Frequently Asked Questions
Why do warts have tiny black dots in them?
The tiny black dots often seen in warts are not seeds or dirt. They are actually small, clotted blood vessels that supply blood to the wart. This is a very common feature of both common warts and plantar warts (warts on the soles of the feet). If you pick at a wart, these vessels can bleed easily. Remember, picking at warts can also spread the virus to other areas of your body.
Are warts highly contagious, and how can I avoid spreading them?
Yes, warts are contagious. They spread through direct contact with a wart or by touching surfaces contaminated by the human papillomavirus (HPV). To avoid spreading them, refrain from picking, scratching, or biting your warts. You should also avoid sharing personal items like towels, socks, or nail clippers. If you have plantar warts on your feet, avoid walking barefoot in public areas such as communal showers, locker rooms, or swimming pools.
What is the fastest way to get rid of a wart at home?
The most effective at-home treatment is consistent use of over-the-counter salicylic acid products. For best results, you need to apply the treatment daily for about twelve weeks. Salicylic acid works by gradually peeling away the infected skin layers. It is important to be patient and consistent, as warts rarely disappear overnight. Covering the wart with tape or a plaster can also help the medication penetrate deeper into the skin.
Will my warts eventually just go away on their own?
Yes, the majority of warts will eventually resolve on their own without any treatment. It generally takes about two years for your immune system to recognize the virus and clear the warts completely. This is especially true for children, who get warts very frequently. However, because warts are contagious and can cause discomfort or embarrassment, many people choose to treat them to speed up their removal rather than simply waiting.
When should I see a doctor instead of treating a wart at home?
You should see a doctor if your wart is extremely painful, bleeds frequently, changes color or appearance, or is located on your face or genitals. It is also wise to seek medical advice if you have multiple warts, if the warts are spreading despite home treatment, or if you have a weakened immune system. A doctor can offer advanced treatments like freezing (cryotherapy), blistering agents, or careful surgical removal.
What is the difference between a regular wart and a plantar wart?
A common wart usually appears on the hands or fingers as a rough, raised, rough-textured bump. A plantar wart, on the other hand, develops specifically on the soles of your feet. Because of the pressure from standing and walking, plantar warts grow inward rather than outward and are often covered by a thick layer of callus. This inward growth can make plantar warts quite painful, feeling similar to a pebble in your shoe.
Why do some people seem to get warts more easily than others?
Warts are caused by HPV, and everyone's immune system responds to this virus differently. Children and teenagers are affected most frequently because their immune systems have not yet built up a defense against the many strains of HPV. People with weakened immune systems, or those who frequently bite their nails or pick at hangnails, are also much more susceptible because tiny breaks in the skin give the virus an easy entry point.
How can ScanSkinAI help me figure out if I have a wart?
ScanSkinAI can analyze a photo of your skin bump and compare it to common visual patterns of warts and other skin lesions. It is a helpful preliminary screening tool to guide your next steps. However, ScanSkinAI cannot provide a definitive medical diagnosis. Because some serious skin conditions can sometimes mimic the appearance of a harmless wart, you should always consult a healthcare professional for an accurate diagnosis and an appropriate treatment plan.
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Medical References
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Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. The content on this page should not be used to diagnose or treat any health problem. Always consult with a qualified healthcare professional for proper medical evaluation, diagnosis, and treatment of your condition.