Itchy vulva at night may be caused by the following reasons: First, there is dermatitis of the vulva, when sleeping at night, the local temperature will rise because of covering the quilt, so it will lead to local itching, there may be red papules found in the vulva local, it is recommended that timely treatment with drugs, and avoid cold and hot stimulation, and in the diet can not eat sour and spicy, stimulating food, so that the clinical symptoms will be relieved as soon as possible. This will help to relieve the clinical symptoms as soon as possible. Secondly, itching of the vulva at night may be due to the presence of pinworms, which crawl out of the anus at night to lay their eggs, and this situation will lead to local itching caused by pinworms crawling in the vulva, and it is recommended to know whether there is pinworm infection through routine stool examination, and then actively treat it.