The phenomenon of bulging after acupuncture is mostly due to bleeding from the blood vessels punctured by needles, and can also be seen in patients with coagulation disorders. Bulging after acupuncture refers to the acupuncture-induced subcutaneous hematoma or bleeding symptoms, manifested as bleeding or swelling and pain at the site of needle puncture after the needles, followed by bruising, hard lumps, nodules and other symptoms on the skin. The cause of this phenomenon is mainly because the blood vessels were pierced during the needling or the patient himself has coagulation to dysfunction related diseases. Needle puncture after the emergence of bulging, hematoma patients do not need to be too afraid, after timely treatment can subside, will not cause great damage to the body. For the relatively small hematoma without special treatment, under normal circumstances, the body can be self-absorbed, while for the larger hematoma need to be timely cold compresses to relieve the symptoms. Doctors need to avoid blood vessels during the operation of acupuncture, strict observation of the patient’s condition, if discomfort immediately out of the needle. It is recommended that patients needing acupuncture treatment go to a regular hospital, not blindly operate on their own, so as not to cause damage.