Itching of the vulva after menstruation may be due to allergy to the sanitary napkin used, or the dampness of the vulva may cause vulvar eczema and vulvar itching due to changing the sanitary napkin not very diligently during menstruation. Another cause is vaginitis. Since menstrual blood can inhibit the reproduction of bacteria in the vagina during menstruation, itching will not occur in general. After the menstrual period, the bacteria in the vagina start to grow and multiply again, so the vulva itching after the menstrual period will occur. The doctor will be able to determine the problem through an interview and a laboratory test of the leukorrhea, and treatment can be carried out according to the results of the test.