You will have been prescribed podophyllotoxin to treat anogenital warts. Anogenital warts are caused by the human papillomavirus (HPV) which can be passed on by close sexual contact. They are small lumps that develop on the genitals and around the back passage (anus). Podophyllotoxin is a topical preparation which is applied directly to the surface of the wart. It works by preventing the wart cells from dividing, which stops them from increasing in number. As the wart cells die, new healthy tissue grows in their place.
This is a companion discussion topic for the original article at https://patient.info/medicine/podophyllotoxin-for-anogenital-warts-warticon