Generally speaking, it is normal for a woman to have a small amount of yellowish color after her leukorrhea has dried on her underwear, without any obvious odor and without any obvious vulvar itching. This is due to the fact that the leucorrhea will be oxidized to yellowish color on the underwear in small amounts. If the leucorrhoea is yellowish and accompanied by odor and vulvar itching, then you should consider if it is a sign of vaginitis. In this case, it is best to go to the hospital gynecology department to check the white belt routine, confirm the type of vaginitis, and then according to the results of the symptomatic vaginal drug treatment treatment.