The majority of infections occur in people in their early teens and twenties, with incidence declining as people age.
Sexual activity is a risk factor for the disease, as is immune suppression.
Common Warts are found in areas which are exposed and frequently rubbed, such as on the hands and knees. They are raised and rough. Plantar warts are painfuldeep warts found often on the bottom of the foot, and other areas which bear much weight. Butcher' warts is caused by and is frequently found in butchers, who are exposed to the virus when cutting meat. Flat or Plane Warts , common in children, are typically located on the arms, knees and face.