Redness of the vulva in a one-and-a-half year old girl can be considered to be related to causes such as diaper dermatitis or vulvovaginitis, which can be treated with general management and medication. Specific should depend on the cause of the disease. 1. diaper dermatitis: need to timely detach from the contact material, redness and erosion of the buttocks can be used to wipe the affected area with comfrey oil, can be appropriate exposure of the skin, if necessary, can be prescribed to be oxygen blowing, infrared physiotherapy and other methods of treatment, the serious can be added under the guidance of the doctor with Dinocaprolactone cream for external use. Parents should pay attention to check the child’s buttocks, change clean diapers in time, wash and dry the buttocks. 2. Vulvovaginitis: pay attention to keep the vulva clean, dry and reduce friction; can improve the urine routine, urine culture and other tests, follow the doctor’s instructions to choose cefazoxime and other antibiotics anti-infection treatment. Children with vulvar redness and uncomfortable symptoms, it is recommended to consult a doctor in a timely manner, improve the relevant examination to clarify the diagnosis, and then follow the doctor’s instructions for targeted treatment.