Vulvar cancer is a type of malignant tumor in female gynecology. Clinically, the following examinations can be used to identify the cause of vulvar cancer. First, testing for human papillomavirus (HPV) can be conducted. If the patient is found to be infected with HPV, then the cause of vulvar cancer can be considered to be due to viral infection. Additionally, herpes virus testing can also be performed, as many patients with vulvar cancer are caused by herpes virus infection. Thirdly, cytological examination of the vulva can be conducted to detect if there are any malnutritive lesions, such as vulvar lichen sclerosus, and other diseases like dermatophytosis, which are also reasons for the high incidence of vulvar cancer.