Subcutaneous hemorrhagic spots are bleeding caused by ruptured capillaries in the body, medically known as purpura, which is a purplish-red spot that points out blood under the skin and does not fade when pressed. Subcutaneous bleeding caused by unintentional trauma in daily life is usually absorbed gradually. However, in the case of hemostatic dysfunction, large subcutaneous hemorrhages can occur with a slight touch, or spontaneous subcutaneous hemorrhages can occur without injury. Depending on the size of the bleeding area, it can be categorized as petechiae, purpura, or ecchymosis. The bleeding diameter of petechiae is not more than 2mm, that of purpura is 3~5mm, and that of petechiae is more than 5mm. The etiology of cutaneous mucosal bleeding mainly includes abnormalities of platelets, abnormalities of coagulation function, and abnormalities of blood vessel wall function, and involves a variety of diseases. If subcutaneous hemorrhages appear, it is recommended to consult a regular hospital as soon as possible for early treatment to avoid delaying the condition.