[Xuehui: the extension of acupuncture and moxibustion theory on the exerting site of treatment].

It is common to use acupuncture and moxibustion at unspecified area on the skin, however, its theoretical improvement is little compared with the specified area such as acupoint. The concept of xuehui originated from the discussion regarding the function and significance of the crossing of minute collateral and xigu. Based on the in-depth analysis of relevant texts, it is believed that its content and nature should belong to the theoretical understanding of acupuncture at unspecified area; moreover, the correlation and differences of theory and expression between xuehui and acupoint is analyzed from the perspective of acupuncture treatment location. The discussion on xuehui is theoretical improvement of acupuncture treatment experience at unspecified area, which should become the resource of acupuncture theoretical construction, and enrich the understanding of the law and essence of acupuncture stimulation on the body surface.