There are many reasons for the darkening of the vulva, which may be caused by inflammatory diseases, local stimulation, hormonal effects, patients should seek medical advice in time, and improve the symptoms through medication, daily care and other measures under the guidance of the doctor. 1. Inflammatory diseases: may be due to vaginitis or cervicitis and other causes, the patient may have increased vaginal secretions, long-term lack of attention to vulvar hygiene, resulting in black skin. At this time, patients should be treated with drugs such as metronidazole and clotrimazole under the guidance of doctors. Keep the vulva dry and clean in daily life. 2. Local stimulation: may be due to the underwear is too tight, long time use of sanitary napkins and other items friction caused by the patient may appear vulvar blackening and other symptoms. At this time, patients should wear loose, pure cotton underwear to reduce the local stimulation of the vulva. 3. Hormonal influence: may be due to endocrine disorders, androgenism and other reasons, the patient may appear vulvar skin color deepening, at this time the patient can be under the guidance of the doctor to actively treat the primary disease. There may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment. The above medications should be used under the guidance of a doctor, avoid self-medication.