The darkening of the labia is mostly caused by pigmentation. Common causes include genetic factors, endocrine disorders, and inflammatory stimulation. The treatment methods are as follows: 1, photorejuvenation. The principle of action is that broad-spectrum color light acts directly on the deep layer of the skin, decomposing the pigment until the pigment fades, with fast treatment and good results. 2. Labia bleaching surgery. It is a procedure that affects the dermis directly through pigmentation to restore the pink color of the labia and does not affect the perineal skin after surgery.3. Drugs. The first time you have to go to the hospital, you will have to go to the hospital. Usually women with gynecological inflammation should be treated as early as possible to avoid stimulating the labia resulting in pigmentation.