The darkening of the private parts is caused by the stimulation of endocrine hormones in the body, which is mainly due to the stimulation of the skin mucosa of the sexual reproductive organs by estrogen and progesterone secreted by the ovaries after they start to develop. This is similar to having pigmentation, which can be significantly darker than the rest of the skin, light brown or dark brown. Most people with darker skin have darker private parts, which is a physiological change that represents the gradual development of the sexual organs. However, before puberty, the color of the vulva and the color of the skin is about the same. If you find obvious changes and the color is darker, it is recommended to go to the hospital for a gynecological examination in time.