Colonic melanosis is mostly due to chronic constipation and frequent use of herbs to relieve the symptoms of constipation. The pigmented components of these herbs are deposited on the colonic mucosa. Long-term use of anthraquinone-based herbs such as senna and rhubarb can cause this disease. The endoscopic tiger-like manifestation is called colonic melanosis, which has a certain chance of cancer, so it is recommended to improve the constipation by making adjustments and try not to use herbs for a long time to relieve the symptoms. You can improve the symptoms of constipation by consuming more vegetables and fruits, drinking water properly and exercising more. If necessary, you can apply power drugs and probiotics to relieve, and pay attention to the regular review of colonoscopy.