There are many possible reasons for the darkening of labia minora, such as normal pigmentation, foreign object contact stimulation, frequent sexual intercourse and masturbation, etc., which should be judged according to physical signs, hormone levels and other examination results to come up with the best treatment plan. 1, normal situation: when women develop in puberty or pregnancy, the hormone secretion in the body increases, pigmentation will be deposited at labia minora, and the color of labia minora will deepen, which can be dark purple, brown, etc. The color of labia minora deepens and can be dark purple, brown, etc., which varies from person to person, usually without special symptoms, and no special treatment is needed; 2, contact stimulation: wearing unsuitable underwear for a long time, using unsuitable sanitary napkins, rubbing labia for a long time can lead to black color, you can change to loose underwear, breathable sanitary products; 3, frequent sexual behavior: sexual behavior may cause the labia minora to be congested once and for all, and the color becomes darker, long-term frequent sexual behavior may make the pigment permanently The frequency needs to be adjusted appropriately; 4, endocrine abnormalities: abnormally high estrogen levels may cause excessive development of labia minora, causing pigmentation. Long-term bad emotions can lead to functional endocrine disorders, which require timely adjustment of the mind; abnormal thyroid function can also lead to black labia minora, usually accompanied by enlarged neck or less hair, etc. The examination of thyroid hormone and thyroid stimulating hormone level in the blood can confirm the diagnosis, which can be supplemented with thyroid hormone and surgical treatment, etc.; hormone level disorders in diabetic patients can also lead to estrogen abnormalities, causing labia minora to become black. It is possible to detect fasting blood sugar regularly and use glucose-lowering drugs for treatment; 5. Melanoma: it is a malignant tumor, and it is necessary to seek medical attention promptly when you are alert to local skin color darkening and symptoms such as bulging, itching, enlargement, breaking, bleeding and pain. As long as there is no disease factor and it does not affect normal life, women with black labia minora generally do not need to deal with it. Women should keep their vulva clean and hygienic, and regular gynecological checkups are recommended. There is no need to be too obsessed with the color of the labia minora, nor should they have low self-esteem because of the black color of the labia minora.