Warts are caused by the DNA-containing human papillomavirus (HPV). There are at least 100 genetically different types of HPVs.
- The virus enters the skin after direct contact with recently shed viruses kept alive in warm, moist environments such as a locker room, or by direct contact with an infected person. The entry site is often an area of recent skin injury. The incubation time (from when the virus is contracted until a wart appears) can be one to eight months.
- Contrary to popular mythology, touching a frog will not give a person warts.
Medically Reviewed by a Doctor on 12/11/2014
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