The first thing you need to do is to go to the regular hospital to check the blood routine and coagulation function to exclude subcutaneous bleeding caused by abnormal platelets or abnormal coagulation function. If the above results are normal, it may be related to the thin subcutaneous fat of the skin, poor protection of blood vessels or poor elasticity and brittleness of the blood vessels themselves, generally do not need special treatment, avoid trauma can be given rutin tablets, vitamin C and other oral to improve the permeability of blood vessels. If platelet abnormality needs to go to hematology department in time for treatment, if coagulation function abnormality needs to check liver function, exclude coagulation function abnormality caused by liver function abnormality, and actively treat the primary disease.