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Warts are caused by viruses in the human papilloma or HPV family. This is a group of more than 200 related viruses that are spread through skin contact, shared objects or sexual contact. Breaks in the skin promote spread. As many as one in three children and teenagers are estimated to have warts, while only 3 to 5% of adults. With the thought that the more mature immune system is better able to prevent their development. People who are immunocompromised develop warts more easily, and they can be harder to treat.