“Plantar” means “Of the sole” in Latin. Unlike other types of warts, plantar warts are typically quite painful as the pressure from walking and standing forces them to grow into your skin. Like all warts, Plantar warts are caused by the human papillomavirus (HPV) virus, specifically types 1, 2, 4, 60, and 63. Underneath the skin, the wart can have finger-like roots that reach down and grow, making them very difficult to treat effectively from the surface.