The only harm is the infection caused by the lack of standardized operation. Generally, in regular hospitals, regular doctors will sterilize the bloodletting treatment, and there will not be any side effects. What are the main diseases treated by bloodletting at the large spine? Bloodletting at the Great Vertebrae point is mainly used to treat acne on the face, that is, acne can be treated with bloodletting at the Great Vertebrae point by piercing it with a skin needle and then cupping and releasing the blood. Bloodletting at the Dazhi point can also be used for the treatment of cold and fever, and the effect is very good, that is, when you have a cold and fever, pierce the Dazhi point and then cupping, together with the lung points on both sides, the treatment of cold and fever is very good, and can achieve immediate results.