Verrucas are wart on yer feet as gingernut has said.
Until October 02 we used to freeze those (like we do with hand warts) but recent evidence suggests that this is not effective treatment so we stopped it.
Best thing is to scrub them down with pumice stone and put something like Bazooka; Salatac etc on it.
They're a nuisance more than anything else and in principle selflimiting (and will disappear most of the time on their own accord)
FD