Do I need to treat them at all?
Not necessarily. Around two-thirds clear by themselves within two years in children, and treatment takes months of daily effort. If they are painless and not bothering anyone, waiting is a perfectly sensible choice. Treat them if they hurt, spread, catch on things, or you simply want them gone.
Why hasn't the treatment worked?
Almost always because it was stopped too early or the filing was skipped. The method is: soak, file, apply, cover — every day, for at least twelve weeks. Most people stop at three or four weeks, or apply the acid to an unfiled surface it cannot penetrate. Persistence is the treatment.
What are the little black dots — are those the roots?
No. Warts have no roots. The black dots are tiny clotted blood vessels within the wart, which sits entirely in the top layer of skin. There is nothing beneath to dig out, and trying to do so causes infection and scarring rather than a cure.
Is it a verruca or a corn?
Two useful checks. A verruca interrupts the skin lines — the ridges of the sole run around it rather than through it — while a corn keeps them running straight over. And a verruca hurts when pinched from the sides; a corn hurts when pressed down. Getting this right saves months of the wrong treatment.
Can my child still swim?
Yes. There is no exclusion from swimming, school or sport. Cover a verruca with a plaster or a verruca sock and carry on. Keeping a child out of the pool for this is unnecessary and unfair to them.
I have diabetes — can I use the treatment from the chemist?
No, please do not. Salicylic acid and freezing work by deliberately damaging skin, and on a foot with reduced sensation or blood supply that is a genuine route to an ulcer and infection. Get it looked at by a podiatrist or doctor instead — this is one of the clearest do-not-self-treat situations in this whole area.
Could hand warts turn into genital warts?
No. Different HPV types cause each, and warts on the hands do not become genital warts. Both are caused by low-risk types that do not cause cancer.
It looks like a verruca but it is not getting better after months.
Get it examined. A lesion on the sole that has not responded to correct treatment over several months needs looking at properly, because some skin cancers on the foot are mistaken for verrucas and treated for a long time before anyone questions the diagnosis. It is usually nothing — but it is worth confirming rather than repeating the freezing.