Anal warts are the same as genital warts. Genital warts frequently affect the skin of the anus, even in patients who haven't had anal sex.
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Anal warts are usually a sign of HPV a form of STD that is
contracted through transmission that is usually sexual in nature. I
suppose a husband would contract anal warts through anal sex with a
partner that had genital warts.. however this is a rough
assumption.