The first is chemical vulvovaginitis, which is mainly caused by the lack of ventilation of the vulva during menstruation with sanitary napkins, moist sanitary napkins, and menstrual blood stimulating the vulvar skin, and can be treated symptomatically with topical erythromycin ointment after local disinfection and cleaning. The second kind is caused by vaginal secretions stimulating the vulva, especially mycotic vaginitis secretions. For this case, you need to perform routine examination of the leucorrhoea to clarify the type of vaginitis and then use the right medicine. The third type is vulvar skin dystrophy, which is mainly caused by long-term stimulation of the vulva by external chemical substances and secretions and humid environment, resulting in local skin atrophy lesions.