Many of us have had an irritating bump — or a cluster of them — on our hands, feet or even face. It may have been a wart. These common skin growths are caused by various strains of a particular virus ...

Add Yahoo as a preferred source to see more of our stories on Google. Close-up of the hands of a school-age boy applying wart tincture on his big toe at home. (KatuSka via Getty Images) Subscribe to ...