The reasons why girls itch down there are the following: 1, vulvovaginal pseudomycelium yeast disease. 2, trichomonas vaginitis. 3, bacterial vaginosis. 4, mycoplasma, chlamydia infection caused by vaginal inflammation. 5, vulvar dermatitis. 6, vulvar eczema. 7, vulvar dystrophy. 8, vulvar sclerosing tessellations. 9, if there is diabetes, urinary sugar stimulation, can also cause vulvar itching. So girls who have vulvar itching, although the vast majority are due to inflammation of the vagina. It is recommended to go to the hospital to do a detailed examination, according to the cause and then give treatment, so as to achieve better clinical efficacy.