Painful itching at the vaginal opening after menstruation may be caused by inflammation or due to allergy to sanitary napkins. If there is excessive leucorrhea, yellowing and odor after menstruation, along with vulvar itching, you may have vaginitis. It is recommended to go to the hospital for laboratory tests of the leukorrhea and to treat it with medication according to the results of the tests. Because there are many types of vaginitis, the treatment and medication for each type of vaginitis are different. Therefore, once abnormal leucorrhea occurs, you should go to the hospital for examination. If there is no abnormality in the leukorrhea and simple vulvar itching occurs, mainly the itching of the skin of the vulva is more serious and accompanied by small pimples, it may also be due to allergy to sanitary napkins or local irritation caused by the lack of ventilation of the vulva or the small frequency of changing sanitary napkins when menstruation occurs. This situation can be washed with boiling water, keep the vulva clean and hygienic, wear cotton breathable underwear, if not relieved, go to the hospital as soon as possible to let the doctor face to face. The above content is for reference only. Please refer to the doctor’s consultation for specific medication and treatment.