The yellow discharge on the panties is considered to be leucorrhea, a small amount of menstrual blood residue, urine residue drops on the panties will appear yellow discharge, usually pay attention to vulva hygiene, wash vulva with warm water every day, change panties regularly can prevent the panties become yellow. If you have yellow discharge on your panties with vulvar itching symptoms, consider that it is caused by vaginitis, causing yellow discharge is mostly bacterial vaginitis, it is best to do the laboratory examination of the discharge in time and apply metronidazole suppositories under the guidance of a doctor after identification. If there is fire, urinary tract infection, etc., it is easy to cause frequent urination, urinary urgency, yellow urine, urinary incontinence, etc. It is easy to have urine residue dripping on the underwear. The actual fact is that you will be able to prevent your underwear from turning yellow by drinking more water and wiping it with toilet paper after each urination, paying attention to hygiene during menstruation, and if you get it on your underwear it is best to wash it in time to clean it.