Women’s lower part is black, that is, the perineum is black. Under normal circumstances, women’s perineum is affected by pigmentation, it is black, generally do not need to worry about it. However, if the skin of perineum is darker than that of other people, it should be considered that it is related to heredity, elevated level of estrogen, frequent sex life and nevus pigmentosus, etc. The specific analysis is as follows: 1. Heredity: If the parents’ skin color is darker, it may lead to the children’s skin color being darker as well, which may result in the perineum being darker, or darker than other people. 2. Elevated estrogen levels: After puberty, women are affected by elevated estrogen levels, which can lead to elevated melanin-stimulating cells, resulting in a black perineum. This situation is mostly physiological, there is no need to worry, not to mention the need for special treatment. 3. Frequent sex: When women have sex too often, the perineum will turn black due to excessive friction. In this case, there is no need to worry, reduce the frequency of sexual life can slowly improve. 4. Melanotic nevus: It is mostly formed by a group of benign melanocytes, and can appear in various parts of the body. If it appears on the perineum, it will appear black on the perineum. Nevus melanosus generally does not need special treatment, if you think it affects the aesthetic appearance, you can also take laser treatment. To summarize, there are many causes of black perineum, most of which are physiological and do not need to be treated. Rarely for pathology, affecting the aesthetic situation can consider laser surgery to remove, specific circumstances recommended to consult the doctor to clarify.