Candida infection is mainly caused by the following reasons: 1. The main reason is caused by the infection of Candida at the anus to the vagina, because the anatomical relationship between the vagina and the anus is adjacent and relatively close, once the vulva is not hygienic, it may lead to the infection of Candida, which will cause local redness and swelling of the vulva or tofu slag-like leucorrhea. 2. Because of the use of A large number of antibiotics lead to dysbiosis in the body, so it will cause Candida to multiply and cause vulvovaginal pseudomonal yeast disease. 3. During pregnancy, due to a large increase in estrogen, the secretion of glycogen in the vagina increases, which can easily lead to the multiplication of Candida and cause the corresponding symptoms in the clinic.