Back scraping is generally harmless, but it may cause adverse effects for patients suffering from certain conditions, such as skin damage or aggravation. Generally speaking, for patients suffering from certain skin diseases or back ulcers, gua sha will not only cause damage to the skin, but may also lead to infection and worsening of the condition. If patients often scrape the skin will damage the skin, patients long-term scraping, may also increase the burden on the body, scraping the location is difficult to recover. At the same time, patients with heart disease, liver disease and blood disease should not scrape, if insist on scraping, it may cause harm to the patient’s body. It is recommended that patients scraping gua sha, should be carried out by a professional doctor, in order to avoid adverse consequences.