Patient's question:
NoDoctor's answer:
1. Genetic factors.2. Caused by excessive sexual activity.
3. Normal pigmentation.
That is to say, sexual intercourse leading to darkening of the labia, including the vaginal opening and both inner and outer labia, is due to prolonged and repeated frictional stimulation of the labia during sexual activity, resulting in increased local pigmentation. Over time, the color will gradually darken, which is a normal physiological phenomenon. Additionally, sexual stimulation hormones can cause the labia to develop a dark hue.