The main reasons for large and black labia are as follows: First, it may be due to the usual sex life is too frequent, excessive friction, most women are triggered by this situation. Second, it may be the body’s hormone secretion, such as estrogen and progesterone secretion, leading to melanin deposition, thus appearing labia black symptoms, at the same time can not be completely excluded, labia aging and other issues. Third, there may be genetic factors, everyone’s body is not the same, if other family members belong to the black skin, then the labia black, also belong to the normal situation, you do not have to worry about, if it does not affect the normal life, there is no other abnormal lesions, you do not have to carry out the treatment. Normally, it is best to eat less food containing melanin, pay attention to good dietary regulation, so as not to lead to the emergence of such symptoms.