Subcutaneous petechiae of liver cancer usually have no specific manifestation and are not related to bumping, but can be combined with bleeding from other parts, such as petechiae and ecchymosis in all parts of the body, especially in the places under pressure, and bleeding in the mouth and nasal cavity. 1. Coagulation factors are synthesized and secreted by liver, and when liver cancer occurs, liver cells can be damaged, thus affecting liver function, resulting in lack of coagulation factors and coagulation dysfunction, which leads to subcutaneous hemorrhage and petechiae, which is usually not related to bumps and bruises, and can be combined with gastrointestinal tract hemorrhage and cerebral hemorrhage. 2. In addition, most patients with hepatocellular carcinoma are combined with portal hypertension of liver cirrhosis and hypersplenism, and hypersplenism leads to large consumption of platelets, which causes petechiae formation. When subcutaneous petechiae appear in hepatocellular carcinoma, standardized treatment should be carried out under doctor’s guidance to improve the prognosis.