If there is a dry, scummy white discharge on the underwear, it may be clinically due to an increase in vaginal discharge. The reason for the increase in vaginal discharge is both physiological and pathological. If there is no symptom, there is a white scum-like discharge, it may also occur before menstruation, mainly because before menstruation, the endometrial gland secretion is exuberant, which will lead to an increase in secretion, so the increase in secretion in the underwear after drying, there will be a white scum-like secretion. It is recommended to just keep the area clean. If this situation occurs at other times, accompanied by vulvar itching or localized burning sensation in the vagina, the vast majority of vaginal inflammation, you can do routine tests of the leukorrhea, according to the results and then give treatment.