Radiofrequency ablation is usually performed on one or both sides of the lumbar spinous process, and the puncture needle needs to be passed through the muscle fibers of the psoas major muscle during the operation, which inevitably causes some damage and bleeding to some parts of the psoas major muscle. It is likely that the petechial hemorrhage in the thighs after surgery is caused by the flow of blood down the lumbaris major muscle gap in the thighs during the puncture process. There is no need to panic in this case, usually after a period of self-absorption, or appropriate treatment, such as the use of some Chinese medicine preparations with blood circulation and blood stasis can be improved and absorbed.