Scraping with bruises may be caused by excessive scraping strength or subcutaneous bleeding caused by the patient’s brittle blood vessels. 1. scraping too much strength: due to continuous scraping, will make the skin surface of the small blood vessels, tiny blood vessels, capillaries rupture, that is, out of gua sha. Scraping too strong may lead to excessive chagrin, thus bruising. 2. patient blood vessel is brittle: blood vessel is brittle patient with normal strength scraping gua sha, may also appear local bleeding too heavy situation, thus lead to bruising. Therefore if the patient himself has a bleeding tendency, it is best not to scrape. The general situation of the bruise after a period of time will gradually subside, if the bruise is repeated or serious or produce local discomfort, please go to the professional hospital in time for diagnosis and treatment. Scraping is recommended to be operated by a professional physician after identification, not to operate on their own, in order to prevent harm to the organism.