Leucorrhea with itching like bean curd is a manifestation of mycosis fungoides. Mycosis vaginalis, also known as vaginal pseudomycosis, is mainly caused by Pseudomonas albicans. When patients have a decrease in systemic and vaginal local immunity, Pseudomonas albicans proliferates and the manifestation of vaginitis occurs, the main triggers are pregnancy, diabetes mellitus, massive application of immunosuppressants, broad-spectrum antibiotics and patients who receive a lot of estrogen therapy. Pregnancy and diabetes make the immunity of the body decrease, which is favorable to the growth of pseudofilamentous yeast; large amount of application of immunosuppressants can also make the resistance of the body decrease; long-term application of antibiotics inhibits the growth of lactobacillus, which is favorable to the reproduction of pseudofilamentous yeast; others such as wearing chemical fiber underwear and obesity, especially obese patients, can make the local temperature and humidity of perineum increase, which is favorable to the reproduction of pseudofilamentous yeast.