The vulva itches. Why?

Pruritus vulva is a common gynecological symptoms, vulva is sensitive to the location, any external stimulus will cause genital itching, common reasons are as follows: one, due to allergies caused by itching, such as a certain drug or the use of inappropriate sanitary napkins, or a long time to wear airtight chemical fiber underwear, caused by allergic itching. Third, vulvar diseases such as vulvar malnutrition. Fourth, systemic diseases in the vulva performance, such as diabetes, vitamin deficiency and other diseases.