Itching on both sides of the labia of 11-year-old girls may be caused by trichomonas vaginitis, candida vaginitis, allergies and other factors, you can use some drugs such as metronidazole, dexamethasone and other drugs. 1. Trichomonas vaginitis: a vaginal inflammation caused by Trichomonas vaginalis, the main symptoms are vulvar itching and increased vaginal discharge, can be treated by oral metronidazole, tinidazole and other drugs. 2. Candida vaginitis: it is a vaginal inflammation caused by Candida infection, often manifested as vulvar itching and abnormal vaginal secretion, which can be treated by oral miconazole, fluconazole and other drugs. 3. Allergy: when vulvar allergy, the vulvar area will appear redness, itching and other symptoms, can be local application of some hormone drugs such as dexamethasone for treatment. There are many reasons for the itching of the labia of 11-year-old girls, should be timely to the hospital, improve the relevant examination, such as pathogenetic examination to clarify the cause of the disease, under the guidance of the doctor’s symptomatic treatment, avoid unauthorized use of medication.