Why do labia minora turn black

Patient's question:

Dear Doctor:
I have been married for 2 years, and my libido is very high. A few days ago, I just bought a smartphone with a camera and started filming myself. Accidentally, I noticed that my labia minora are very dark!! Is it because of too frequent sexual activity?!

Doctor's answer:

The color of the labia minora, apart from being related to a person's race and genetic factors, is also influenced by long-term sexual activity, pregnancy, and even the natural aging process. Therefore, it varies from person to person. During sexual activity, the labia minora are repeatedly exposed to external friction, leading to increased pigmentation in the area. Over time, the color becomes progressively darker, which is a normal physiological phenomenon.
In fact, this applies to other parts of the body as well. As one ages, the skin's color often becomes less vibrant than when younger, though the degree of change varies.

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