Ink and brush drawing from a handwritten copy of the anonymous text Dingchuang yaojue (Essential Art of Boils), executed in 1874 (13th year of the Tongzhi reign period of the Qing dynasty). It indicates the disease location for zhengduikou ding (boils directly opposite the mouth). These are also known as duikou chuang (sores opposite the mouth), nao ju (head abscesses), duikou (opposite the mouth), duikou fa (lesions opposite the mouth) and duikou ju (abscesses opposite the mouth). They occur at the back of the head in the region of the occipital bone. This is accounted a disease of dumai (the Governor Vessel) and the bladder channel of foot taiyang. The preferred therapy is needling and opening (tiaoci), at locations including tianting (Celestial Courtyard), dihe (Earthly Union), yintang (Hall of Seals), yaoyan (Lumbar Eyes), er yong (?), baliao (Hundred Labours - i.e dazhui (Great Vertebra) - and the coccyx point; and internal treatment with beverages of fangfeng (divaricate saposhnikovia root), jingjie (schizonepeta herb) and chuanlian (i.e. huanglian, Chinese goldthread, rhizome coptidis).
