Like "warts are caused by human papillomavirus (HPV). Most warts do not need to be treated medically. Most warts disappear on their own. You should definitely see a doctor if the wart causes pain, bleeds easily, changes appearance, spreads easily to other parts of your body, or comes back. read more here about types and different treatment options. http://www.medicalnewstoday.com/articles/155039.php"