Colorectal melanosis is a black leopard-like pigmentation of the colorectal mucosa. Colorectal melanosis usually occurs in constipated patients, because of long-term oral rhubarb, senna, aloe capsules, fruit guide tablets and so on a series of anthraquinone-containing stimulating laxatives, colorectal mucosa black leopard-like pigmentation. Colorectal hypermelanosis can be mild or severe, in mild cases, only a mild blackening of the intestinal mucosa, only need to stop using laxatives containing anthraquinones for a period of time can be restored. In severe cases, the intestinal mucosa is heavily pigmented with black leopard pattern, and the texture of the blood vessels cannot be revealed. This situation has a certain risk of cancer, and in addition to discontinuing the use of stimulating laxatives, it is also necessary to eat more coarse fiber food to facilitate the recovery of the intestinal mucosa. Stool abnormalities, it is recommended to seek medical attention in a timely manner, under the guidance of a professional doctor to standardize the treatment, so as not to delay the condition.