Redness, swelling and itching of the vulva during menstruation is considered to be caused by allergy to sanitary napkins or irritation caused by menstrual blood. During menstruation, due to low resistance, if itching, redness and swelling of the vulva occurs after changing to a new sanitary napkin, it is considered to be caused by allergy to the sanitary napkin, so it is recommended to stop using it and wash the vulva to keep the vulva clean and dry. During menstruation, if the sanitary napkin is not replaced in time, the menstrual blood stimulation of the vulva can easily cause redness, swelling and itching of the vulva, it is recommended to wash the vulva every night, choose cotton, breathable underpants and sanitary napkins, and if the itching is serious, you can use local Zihuadidin cream to apply it locally. Avoid scratching the vulva when itching occurs during menstruation to avoid skin rupture, and vulvar skin rupture during menstruation is easy to combine with bacterial infection and aggravate the local swelling symptoms.