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Monday’s medical myth: warts aren’t contagious

As a general practitioner (GP), I see a lot of warts. They’re a common skin complaint that most people experience at least one in their lives. Common warts are small dome-shaped lumps on the surface of…

You can’t catch warts from toads, but you can from other people. DaveHuth

As a general practitioner (GP), I see a lot of warts. They’re a common skin complaint that most people experience at least one in their lives. Common warts are small dome-shaped lumps on the surface of the skin, typically on the back of fingers, hands, toes, and the front of the knee.

Patients who come in with common warts have usually guessed the growths on their skin are “warts”. But I’m often asked whether they’re contagious and whether any of the old wives' tales work as cures.

The classic myth that warts are caused by touching toads is, of course, untrue. There are many folk remedies for warts that range from the magical (blacksmith’s water – the water that hot iron has been plunged), to the bizarre (taking a dead cat to a graveyard at midnight), and the gruesome (dripping the blood from the head of a decapitated eel onto the skin).

About a third of common warts will disappear in three months, and most in two years. So this might explain why these treatments were considered effective.

We now know that warts are due to infections from a specific group of viruses – human papilloma viruses (HPV), of which there are over a hundred known subtypes.

HPV came into the spotlight when Gardasil, the “cervical cancer” vaccine, became part of the Australian immunisation schedulefor girls and young women. From 2013, the HPV vaccination program will include 12- and 13-year-old boys.

Although some types of HPV can cause cancers (genital, oral, throat), the types of HPV that commonly cause warts on the face, hands and feet do not. And the types of HPV that cause genital warts are different to the ones that cause common warts.

Gardasil, for instance, protects against HPV types 6, 11, 16 and 18. Types 6 and 11 cause about 90% of genital warts, and types 16 and 18 cause about 70% of cervical cancer. Since the HPV immunisation started in Australian, there has been a big drop in the rate of genital warts.

Warts can pass from hand to hand, but they can’t pass from hand to genitals. Flickr/elvissa

Warts are contagious: HPV can be transmitted by direct contact through minor injuries in the skin. After infection, there can be a latency of weeks to years, so warts can appear to come out of the blue.

But rest assured, if you have a common wart on your fingers, you are not going to give yourself genital warts, or even plantar warts, if you touch those parts of your body. Different types of warts are typically caused by different types of HPV, so you could potentially infect the other hand.

So how do you treat common warts?

It’s important to remember that most will go away with no treatment within about two years. The topical over-the-counter treatments (such as salicylic acid and podophyllotoxin) do work, but require patience and persistence. Cryotherapy with liquid nitrogen, performed by your GP, is probably more effective if you want to get rid of your warts quickly. Nothing works that well for plantar warts.

A wondrous variety of wart treatments live on in the modern day. Banana peel ranks high on a Google search but lacks research evidence (and there is little reason why it should work). The popular practice of using duct tape doesn’t seem to be effective.

We may have moved on from touching toads but wart myths are alive and well.

Join the conversation

8 Comments sorted by

  1. George Michaelson

    Person

    hire dive suit, Heron Island. all three of us got a massive dose afterward.

    it kind-of makes sense: wet, warm, and swapped between people.

    but who knew diving was a primary vector?

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  2. Mat Hardy

    Lecturer in Middle East Studies at Deakin University

    A number of us at school got warts on the palms of our hands after doing tug-of-war at the athletics carnival. The slightly abraded skin on the sweaty palms must have made a nice home.

    My wife, who grew up in rural Europe, was sent round to see the village 'witch' for her warts and was cured. She still won't reveal what the cure was, since she was told if she spoke about it, they would come back! Since my father-in-law is a blacksmith, such magic water would have been in plentiful supply though.

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  3. John Browne
    John Browne is a Friend of The Conversation.

    Surveyor

    To cure a wart:-
    1) procure a potato and cut it in two
    2) rub one half on the wart
    3) bury the other half in the backyard (or similar place)

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  4. John Harland

    bicycle technician

    I cut one out once: cut all around it then pop it out, root and all. No sign of it since.

    Assuming that it was likely to be infectious I did take appropriate precautions.

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  5. Leon Smith

    logged in via email @gmail.com

    Duct (gaffa) tape worked for a plantar wart I had a couple of years ago. God knows why, and I accept there's a chance it would have left of its own volition at the same time. But there's no harm in giving it a try!

    Like John Harland I successfully pulled one out from the pad of my finger, root and all. Not very pleasant, fairly messy, but it didn't come back. If only I'd had something sharper than fingernails for that surgery!

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