Verrucas and warts are caused by a virus. Warts primarily occur on the hands and verrucas on the feet.
They are contagious but not harmful. They will go away of their own accord but this can take from several months to years.
The main treatment is to erode them with a Salicyclic Acid product like Bazuka.
You apply the product every day, which puts a plastic seal over the wart. Once a week you file down the dead tissue.
Diabetics must consult the pharmacist before use.