The inexplicable appearance of blood marks like scraping on the body may be related to drug factors such as recent medications, non-pathological factors such as allergies, but pathological factors such as thrombocytopenia, abnormal coagulation mechanisms or capillary abnormalities may also be present. Therefore, timely admission to the hospital is required to check blood routine and coagulation function for clear diagnosis and active treatment. I. Non-pathological factors: 1. Drug factors: If long-term oral intake of relevant anti-platelet coagulation drugs, such as aspirin, clopidogrel, tigretol, etc., can cause abnormal coagulation mechanism, local skin appears blood marks after touching, similar to scraping. Such people need to reduce the dosage or discontinue the relevant drugs in time under the guidance of doctors; 2. Allergy: local skin allergic reactions, such as urticaria, allergic purpura, etc. Allergic reactions can cause local skin capillary fragility and permeability increase, local itching, itching after the appearance of local skin color significantly reddened, purple, appear like scraping blood marks. Need to isolate the allergen, then you can give dexamethasone, prednisone and other hormonal drugs or loratadine and other antihistamines treatment. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. The actual blood pressure of the skin can be easily affected by the pressure of the skin, and the skin can bleed under the skin after touching. The thinning, local vasodilatation and brittle change of the blood vessel wall are prone to scrapie-like changes under the skin scratching and other factors. It can be treated with immunosuppressive drugs, such as azathioprine.