Warts are caused by a viral infection in the top layer of skin. They are non-cancerous epidermal growths most often occurring on the hands and feet of an infected person. While common warts appear on the hands and feet, there are many types of warts that can appear all over the human body.
Warts that occur on the face are known as filiform warts. Plantar warts are located on the bottom and sides of the feet. Warts that are found on areas commonly shaved, such as the face and legs, are known as flat warts. There are also warts that infect the skin under and around fingernails and toenails called periungal warts.
Warts can occur at any age but are most common in children, young adults and people with immune system deficiencies.
Genital warts or condyloma, venereal warts, anal warts and anogenital warts is a highly contagious sexually transmitted disease caused by various sub-types of human papillomavirus (HPV). It is spread through direct skin-to-skin contact during oral, genital, or anal sex with an infected partner. Genital warts often occur in clusters and can be very tiny or can spread into large masses in the genital or penis area. In other cases they look like small stalks.
In women they occur on the outside and inside of the vagina, on the cervix, around or inside the anus. In men, they usually are seen on the tip of the penis. They also may be found on the shaft of the penis, on the scrotum, around or inside the anus. Rarely, genital warts also can develop in the mouth or throat of a person who has had oral sex with an infected person.