What is the reason for pruritus vulvae after each sexual intercourse?

Disease analysis: Hello, pruritus vulvae is a symptom caused by many reasons, mostly because vaginitis caused by trichomonas or fungal infection discharges a large number of abnormal leucorrhea to stimulate vulva; If there is disinfectant to wash vulva and vagina, or some drugs (such as sulfonamides, furacilin, strong alkaline soap, potassium permanganate solution, etc. ) placed in the vagina, causing vulvar skin allergies or dermatitis, and can also cause vulvar itching; Failure to pay attention to cleanliness and hygiene during menstruation, resulting in long-term accumulation of menstrual blood or vaginal secretions in the vulva; Or wear chemical fiber underwear at ordinary times, so that the vulva is often in a hot and humid environment, often causing vulva itching. It is suggested to go to the gynecology department of a regular hospital for etiological examination of vaginal or cervical secretions, definite diagnosis and symptomatic treatment.