1. Local causes: vulvovaginal pseudomycosis (mycosis fungoides) and trichomonas vaginitis are the most common. Bacterial vaginosis, atrophic vaginitis, pubic lice, scabies, pinworms, common warts, herpes, eczema, vulvar squamous epithelial hyperplasia, drug allergy or skin care product stimulation and poor hygiene habits, etc. 2. Systemic causes: diabetes mellitus, jaundice, vitamin A and B deficiency, severe anemia, leukemia, intrahepatic cholestasis during pregnancy, etc. 3. Unexplained vulvar itching. Zhao Jianwu, Department of Gynecology, People’s Hospital of Guizhou Province