Warts is a sexually transmitted disease caused by HPV infection, HPV is a double-stranded DNA virus, also known as human papillomavirus, which only survives in the human body and mainly infects the skin or mucosal epithelial tissues. Sexual behavior is the main risk factor for warts, generally there are multiple sexual partners, high-risk sexual partners, unsafe sex, immune system problems, and other factors, which are as follows: 1, multiple Sexual partners: there are a number of different sexual partners will lead to a higher incidence of warts; 2, high-risk sexual partners: these sexual partners have other multiple sexual partners or HPV infected sexual partners, will also lead to the occurrence of warts; 3, no safety measures of sexual behavior: for example, do not use a condom; 4, the immune system problems; such as taking immune suppression drugs or AIDS patients, diseases and infections The immune system will be reduced, and then it is easy to have bigger or more difficult to cure warts, and the recurrence rate is also higher.