A wart is a growth on the skin caused by the human papilloma virus. They are usually contracted from contact of broken skin with a person who also has the condition. They are usually harmless, although they can last for years and can also disappear and recur. They do not require treatment, although there are treatments available.
About 75% of warts can be cured in 7-10 days by applying a topical preparation of salicylic acid. Cryosurgery has been tried as a treatment, but is not seen as a more effective treatment and often requires several visits. Other treatments are either expensive, have little supporting clinical evidence, or are not FDA approved.