Verruca or warts is primarily caused by a viral infection. These viruses will get into the skin and it will cause a distortion in the growth. Usually like most of the viral infections such as the flu and common cold, they just run their course and will just go away in their own. However it will take so many years before they go away. Also they can be contagious to other people. When they are on the bottom of the foot, they can be painful. For this very main reason it should be consulted immediately with a physician and get treated. Several of method will be very effective to treat them. This dry needling for verruca is the most popular method for those that are hard to treat.