Yellow scabs in underwear after one day of wear, if seen in women, are usually yellowing of the leucorrhoea caused by oxidation or fire, and may also be caused by urine. In addition, it may also be caused by various gynecological diseases, such as vaginitis, cervicitis, endometritis, etc. If seen in men, it is usually caused by urethritis, prostatitis, etc. Patients are advised to visit a hospital to clarify the cause and carry out targeted treatment: a. Women: 1. Vaginitis: mainly including trichomoniasis, vulvovaginal pseudomonal yeast disease, bacterial vaginosis, atrophic vaginitis, etc. In addition to yellowish leucorrhea, it is usually accompanied by obvious odor and other symptoms, which need to be clarified after the type of infection and targeted drug treatment The type of infection should be clarified and then treated with targeted medication. For example, trichomoniasis can be treated with metronidazole and tinidazole, and vulvovaginal pseudomonal yeast disease can be treated with antifungal drugs such as clotrimazole and miconazole preparations. 2. Cervicitis: usually caused by infection of the cervix by pathogens such as Neisseria gonorrhoeae, Chlamydia trachomatis, and others. Due to the stimulation of inflammation, it can be manifested as increased leucorrhea secretion, gray or yellowish, purulent, or accompanied by odor, vaginal bleeding, itching and other symptoms. Antibiotics such as azithromycin, doxycycline, cephalosporins, macrolides, or antiviral drugs, antifungal drugs can be used for treatment according to the type of infection, and surgical treatment is required if cervical polyps are present; 3. Endometritis: usually caused by chlamydia and mycoplasma bacteria entering the traumatic surface of the endometrium after trauma, the main symptoms are persistent abdominal pain, increased and yellowish leucorrhea, and even Fever, headache and other symptoms. Cephalosporins, metronidazole, clindamycin and other drugs can be used for drug treatment, and in serious cases, antibiotic treatment or surgery is required. The actual UTI is usually caused by gonococcal and non-gonococcal pathogens, which can manifest as frequent urination, urgent urination, painful urination, redness and swelling of the urethra, itching, and the appearance of yellow secretions. The patient needs to follow the doctor’s advice to choose penicillin, quinolones, tetracyclines, macrolides and other drugs for antibacterial treatment, if there is urethral stricture, the urethra needs to be regularly dilated, if the effect is not good, the urethral stricture incision or urethral endotomy should be carried out in a timely manner; 2, prostatitis: male patients have yellow scabs in their underwear for a day, but also may be suffering from acute prostatitis, usually by The main symptoms are frequent urination, urgent urination, painful urination, purulent discharge from the urethra, and also nausea, vomiting, fever, weakness, anorexia and other systemic symptoms. Patients are recommended to seek medical attention in time, and can first use broad-spectrum antibacterial drugs such as intravenous cephalosporin and broad-spectrum penicillin to control inflammation, and after the inflammation is gradually controlled, the treatment can be changed to oral penicillins, quinolones and other antibacterial drugs. If the effect is not good or there is an abscess, incision and drainage are needed in time.