There are several reasons why women’s labia are blackened as follows: 1. Consider the labia to be blackened by long-term friction, because the labia minora area is not protected by hair and is rich in blood vessels, once friction is easy to be blackened, such as frequent sex, long time to go through the tight underwear, or engaged in cycling, etc. 2. As women grow older, the hormonal regulation of the body under the effect of hyperpigmentation, which leads to the darkened labia. 3. Consider whether it is due to hereditary factors, the labia are darker after birth, which is generally a normal physiological phenomenon, if there is no vulvar itching, no labia pain, swelling, no leukorrhea with yellowish secretion, odor, etc., you can not be treated, but in life, we should take good care of the vulva and wash it regularly to keep the local cleanliness, cleanliness, choose loose underwear and be diligent in changing the underwear.