患者21岁。外阴瘙痒1个月余,并白带黄色、量多,有异味,阴道隐痛,性交痛。月经无异常。窥阴器检查见阴道黏膜充血,近阴道口1/3段阴道壁有散在溃疡,边缘不整齐,表面覆有污秽的棕黄色坏死物。追问性生活史,有多位性伴其中不乏口交性行为者。无宫内置环史。阴道pH为6·2,胺试验阳性 The patient is 21 years old. Genital itching more than 1 month, and leucorrhea yellow, quantity, smell, vaginal pain, painful intercourse. No abnormal menstruation. Vaginal vaginal mucosal examination see vaginal congestion, near the vaginal wall vaginal wall 1/3 scattered ulcers, irregular edges, the surface covered with filthy brown necrosis. Asked about the history of sexual life, there are many partners, many of whom are oral sex. No intrauterine ring history. Vaginal pH was 6.2 and the amine test was positive