Petechiae of subcutaneous bleeding that do not subside may be caused by hemophilia, vitamin K deficiency, alcoholic cirrhosis and other diseases. 1. Hemophilia: This is very much related to the abnormality of the blood clotting mechanism. The patient’s body will have very few clotting factors, and if they cannot replenish them in time, the bleeding will not stop. A slight bump will lead to bleeding under the skin, and the ecchymosis will not fade away. 2. Vitamin K deficiency: Vitamin K deficiency can cause coagulation dysfunction, which is manifested as nosebleeds, vomiting blood, blood in the stool, bleeding gums, internal bleeding, etc. Subcutaneous bleeding can also occur. Petechiae of subcutaneous hemorrhage may also occur and not easily subside. 3. Alcoholic cirrhosis: Patients with alcoholic cirrhosis have obvious liver damage. It is mainly due to the decrease of the liver’s synthetic function, and the decrease of some coagulation factors such as vitamin K, which will lead to the prolongation of the coagulation time, which in turn will lead to the appearance of petechiae on the skin and mucous membranes that will take a long time to subside. The above are only some of the common causes. If the petechiae of subcutaneous hemorrhage do not subside, you should consult a doctor in time, make a clear diagnosis and follow the doctor’s instructions to standardize the treatment.