Warts are caused by the human papilloma virus (HPV). There are several different types of warts. Warts can grow anywhere on the body but are most common on the hands. It is estimated one in twenty school children have warts.
Plantar warts are ingrown in the feet and are also known as verrucas. Mosaic warts are tiny and can spread all over the sole of the foot. Common warts have a raised surface with a cauliflower-like head. If the wart is touched or scratched the virus can spread to another area of skin. However, it can take up to one year for a new wart to appear.