Why are the labia minora so dark?

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 is related not only to a person's race and genetic factors but also to long-term sexual activity, pregnancy, and even natural aging. Therefore, it varies from person to person. During sexual activity, the labia minora are repeatedly exposed to external friction, leading to increased pigmentation locally. Over time, their color gradually darkens, which is a normal physiological phenomenon.
In fact, this is the same for other parts of the body. As one ages, the skin's color often becomes less vibrant than when younger, though the degree of change varies.

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