The reasons why the vulva is always moist are the following: 1, tight underwear, non-hygroscopic, pants are not breathable, as well as high vulvar temperature, rich sweat glands, sweating is more, the secretion of sweat is not timely evaporation, absorption, vulva appears moist, this situation should wear cotton, moisture-absorbing underwear, pants should be loose. 2, vulva is not clean will cause vulvar eczema, folliculitis, inflammation caused by itching pain, scratching rupture skin