The labia minora is the structure of the perineum, and the color of the perineum varies from person to person, ranging from pinkish in young girls to darkening and even blackening as they get older. The causes of dark labia minora include congenital hyperpigmentation and other causes of increased pigmentation. If the darkening is accompanied by other symptoms, it is necessary to go to the hospital for specialized examination and timely treatment. If the labia minora is only black, it can be solved by laser or pigmented tattooing, but the black color itself is not a disease. If it is accompanied by other diseases, the treatment of other diseases should be the main focus.