The fact that the pubic area is always moist and the color of the underwear is yellow may be caused by an increase in vaginal discharge, which is normally influenced by the cyclical changes in the levels of estrogen and progesterone in the body. The amount of vaginal discharge is higher during ovulation and before menstruation, but the color does not change, it is still clear and transparent, and the smell is not abnormal. Once the symptoms of dampness, yellowing of underwear or itching of vulva or vagina appear, you need to go to the hospital in time to have a routine gynecological examination and take a small amount of vaginal discharge for a routine white belt test. If necessary, cervical fluid-based exfoliative cytology and human papillomavirus tests can be done to rule out the possibility of infectious diseases such as vulvovaginitis, vaginitis and cervicitis, and to clarify the causative organism according to the test results, and then standardize the treatment with appropriate symptomatic medication.