There are many possible reasons for the darkening of labia minora, such as normal pigmentation, external contact stimulation, frequent sexual intercourse and masturbation, etc. Specific should be based on the signs, hormone levels, and other test results to make a comprehensive judgment and come up with the best treatment plan. 1, normal situation: female puberty or pregnancy, the body’s hormone secretion increases, the pigmentation will be deposited in the labia minora, the deepening of the color of the labia minora, which can be dark purple, brown, etc., varies from person to person. The color of labia minora can be deepened, which can be dark purple, brown, etc. It varies from person to person, and is usually not accompanied by special symptoms, so no special treatment is needed. 2. Stimulation by contacts: wearing inappropriate underwear for a long period of time, using inappropriate sanitary napkins, and rubbing the labia minora for a long period of time can lead to the color becoming black, so you can change to use loose underwear and breathable sanitary products. 3. Frequent sexual intercourse: sexual intercourse may make the labia minora congested with blood once and a while, and the color becomes darker. Frequent sexual intercourse: sexual intercourse may make the labia minora transiently congested and darken in color, long-term frequent sexual intercourse may make the pigmentation permanent, and it is necessary to adjust the frequency appropriately. Long-term bad mood can lead to functional endocrine disorders, the need for timely adjustment of the state of mind; thyroid function abnormalities can also appear labia minora black, generally accompanied by neck enlargement or less hair, etc., the blood of thyroid hormone and thyrotropin levels can be diagnosed, can be supplemented with thyroid hormone, surgical treatment, etc.; diabetic patients with hormone level disorders can also lead to estrogen abnormalities, resulting in labia minora black, regular fasting blood tests can be done to detect the level of estrogen. The patient can test fasting blood sugar regularly and use hypoglycemic drugs for treatment; 5. Melanoma: malignant tumor, alert to local skin color blackening, bulging, itching, enlargement, breaking, bleeding, pain and other symptoms, need to consult a doctor in time. Female labia minora black as long as there is no disease factors, does not affect the normal life, generally do not need to deal with. Women should keep the vulva clean and hygienic, it is recommended that regular gynecological examination, no need to be too obsessed with the color of the labia minora, but also do not because of the labia minora color black and produce low self-esteem.