Itchy vulva after intercourse may be caused by allergy to certain substances, trichomonas vaginitis, mycotic vaginitis, vulvar eczema, etc. 1. Allergy to certain substances: Some women are allergic to semen or condoms, and intercourse with these substances can trigger allergy and cause itchy vulva. If the symptoms are mild, you should avoid contact with allergens, wash your vulva, and wear loose and breathable underwear; if the symptoms are serious and even trigger a general allergic reaction, you should seek medical attention in time; 2. Vaginitis: women with vaginitis, such as trichomoniasis and mycotic vaginitis, mainly show increased vaginal discharge and vulvar itching, and the itching symptoms may increase after intercourse. Treatment is based on antibiotic therapy, avoid sexual intercourse during treatment, and do not scratch hard when vulva itching to avoid repeated infection; 3. Vulvar eczema: vulvar eczema can involve the vulva and surrounding skin, causing itching, burning and even pain in the vulva, and the itching may be worse after intercourse. The treatment is based on topical drugs, such as potassium permanganate warm water bath, Denide cream topical, etc. In serious cases, oral drugs such as Benadryl are given to relieve itching and anti-inflammatory, keep the vulvar skin clean and dry in daily life, warm water shower, avoid hot water scalding. There are many reasons for vulvar itching after intercourse, and when the symptoms appear, it is best to go to the hospital to do a gynecological examination and a leucorrhea examination to find out the cause of the itching and then deal with it symptomatically. In daily life, pay attention to cleanliness and hygiene, avoid wearing tight underwear, exercise properly and improve body immunity to help prevent vulvar and vaginal diseases. If you are allergic to condoms, you need to switch to other forms of contraception, such as intrauterine devices.