Warts are small, usually painless growths on the skin. Most of the time they are harmless, caused by the human papillomavirus (HPV). They are benign skin growths that appear when HPV infects the top layer of the skin and are contagious which can spread by contact with the wart or something that touched the wart. Types of warts are Common warts on fingers, Plantar warts on soles, Genital warts and Flat warts. They are widespread in the worldwide population. Although the frequency is unknown, warts are estimated to affect approximately 7-12% of the population. In school-aged children, the prevalence is 10-20%. They can occur at any age. An increased frequency also is seen among immunosuppressed patients and meat handlers.
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http://bmcinfectdis.biomedcentral.com/articles/10.1186/1471-2334-9-119. biomed central, epidemiologic natural history and clinical management of human papillomavirus (hpv) disease: a critical and systematic review of the literature in the development of an hpv dynamic transmission model, bmc infectious diseases 2009 9:119, doi: 10.1186/1471-2334-9-119, insinga et al.