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By Mayo Clinic staffLike warts that appear on other areas of your skin, genital warts are caused by a virus — HPV — that infects the top layers of your skin. There are more than 100 different types of HPV, but only a few can cause genital warts. These strains of the virus are highly contagious and spread through sexual contact with an infected person.
About two-thirds of people who have sexual contact with someone who has genital warts develop the condition — usually within three months of contact, but in some cases not for years.
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