Genital herpes is usually contagious without the onset of the disease. Genital herpes is a sexually transmitted disease caused by herpes simplex virus infection of the external genitalia and perianal skin mucosa, often with blisters, vesicles, ulcers and other symptoms in the perianal and vulvar areas. In addition to sexual transmission, it can also cause morbidity through mother-to-child transmission. Patients with typical lesions, asymptomatic carriers, and patients with a previous history of genital herpes are all infectious. Patients who do not develop the disease, i.e., who do not have clinical symptoms, may also contain herpes simplex virus in their semen or vaginal secretions, and are therefore usually infectious as well. Asymptomatic carriers of genital herpes or patients with a previous history of genital herpes are infectious when they have unsafe sex. The party carrying the virus can directly plant the virus in the other party’s glans, vagina, cervix, anus, oral mucosa and other parts of the body through bodily fluids, or it can also enter the skin through tiny skin fissures on the vulva and other parts of the body, leading to infection in healthy people. Maternal infection with the herpes virus can be transmitted to the fetus through intrauterine transmission or to the newborn during delivery. So genital herpes may be contagious even if it does not develop.