2. Caused by a Virus
As we previously mentioned, a plantar wart is caused by a viral infection. The strain of virus that is responsible for these warts is the human papillomavirus or HPV. People tend to get a little freaked out by this, but the Mayo Clinic notes that this particular virus is extremely common and there are more than a 100 different kinds in existence. However, only a few of them result in a wart on the foot. Other types will cause warts on other areas of the skin or mucous membranes.