What is the cause of black lips?

The blackness of the labia may be related to heredity, constitution and hormones, and there are great individual differences. For example, hormone levels during pregnancy can cause blackening of the labia. Due to individual physical problems, there is more melanin in the body, and the skin around the body is darker. These are all physiological. Some are also related to sexual life. However, if the labia turn black and are accompanied by pain, burning and other symptoms, this kind of pathological blackening may be caused by infection. When necessary, vulva tissue biopsy plus pathological examination, further diagnosis, symptomatic treatment. Usually pay attention to vulva hygiene, try to eat less spicy food.