What Warts Actually Are (And Why They Show Up on Skin) Warts look simple, but scientifically, they’re tiny viral overgrowths caused by specific strains of the human papillomavirus (HPV). These strains ...
Warts are caused by variations of the HPV virus. It can be passed from person to person or from one surface to a person. It’s also possible for warts to spread from one part of your body to another.