If the vulva itches, it is often caused by the following reasons: first, inflammation of the skin of the vulva leads to local eczema of the vulva, which can make the vulva itchy, often due to the habit of using pads in daily life, which makes local ventilation poor, which causes local inflammation to appear itchy. The second one, Candida vaginitis, causes itching outside the vagina because Candida vaginitis can cause not only inflammatory reaction of the vaginal mucosa but also allergic reaction. The third, trichomonas vaginitis, discharge can also stimulate vulvar itching. The fourth, mycoplasma and chlamydia infections, not only cause itching outside, but also cause bladder irritation with frequent, urgent and painful urination. Therefore, when vulvar itching occurs, a detailed gynecological examination and routine laboratory tests should be done, and treatment should be given according to the results.