Well, Genital warts are caused by the human papilloma virus. It is a sexually transmitted infection . So may be your husband was having this infection in past , and did not had any symptoms. The warts can be removed, but the viral infection itself can't be cured. The virus goes on living inside your skin. So you were infected.
If before marriage , you had unprotected sex, with unknown partner, then it is possible that you were carrying the infection, without any symptoms. You should get warts removed by cryotherapy .Also the warts can also be taken off with a laser.
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