治背疽痈疖，一切脓肿。
腻粉 水银 硫黄（各一分同研） 大巴豆肉（十四个）
上将巴豆单覆排铫底，以三物按上巴豆令平，以瓮器盏盖之，四面湿纸，勿令气泄，炭
火四面缓缓烧，时于冷水中蘸铫底。少时又烧频蘸为善，其盏上底内，滴水一点如大豆，干
则再滴，以三滴干为度。候冷，研陈米饮，丸作二十三丸，每服一丸，熟水吞下，疏下恶物，
以白粥补之。予族父藏此方，未易与人，吴中人往往知此药，莫能得真方。一丸活一人，曾
无死者，才取下，即时不痛，其疮亦干。
柞木叶（干四两） 干荷叶（四两） 萱草根（干二两） 甘草节（一两） 地榆（一
两）
上细锉，每服半两，水二碗，煎去半分，二服，早晚各服二服，滓并煎作一服，有脓血
者自安，脓血在内者，自大肠下，未成者自消，忌一切毒物，有疮者贴后药。
通明牛皮胶（一两水半升熬令化） 黄丹（一两入胶中煮三五沸）
上放温冷，以鸡羽敷疮口，有疮即敛，未成疮者，涂肿处即内消。元丰中，丞相荆公疽
发背，医攻之，皆不效，渐觉昏懵，都不省人事，势已危甚。上元知县朝奉郎梁彦意有此药，
自言其效如神，秘其方。但得药，荆公服之，痢下恶物一升许，遂瘥。乃以方献丞相，予从
丞相得之。此药，常人服之，并不疏转，但逐脓血耳。
Treatment for back carbuncles (back sores), abscesses, boils, and all kinds of suppurative swellings.
Ingredients: Nifen (Calomel/Red Sublimate, a compound of mercury and sulfur), Mercury, Sulfur (each 1 fen, ground together); Large Croton seeds kernels (14 pieces).
Preparation: First, arrange the Croton seed kernels in a single layer at the bottom of a pot (diao). Press the three aforementioned substances onto the Croton seeds to make them level. Cover with an earthenware vessel or a cup, seal the four sides with wet paper to prevent gas leakage. Slowly heat from all sides using charcoal fire. Occasionally dip the bottom of the pot into cold water. Repeat heating and dipping frequently until proper. The endpoint is determined by testing: place one drop of water on the inner bottom of the cover; if it dries like a soybean, add another; continue until three consecutive drops dry instantly. After cooling, grind the medicine with aged rice decoction, form into 23 pills. Take one pill per dose, swallowed with warm boiled water. This will induce the discharge of foul matter, followed by nourishing the body with white porridge. My clan father treasured this prescription and rarely shared it. People in Wu often knew of this medicine but could not obtain the authentic formula. One pill saves one person, with no recorded deaths. Once the toxin is discharged, pain ceases immediately, and the sore dries up.
Zha Mu Ye (Dried Leaves of Quercus variabilis, 4 liang), Gan He Ye (Dried Lotus Leaf, 4 liang), Xuan Cao Gen (Dried Rhizome of Hemerocallis citrina, 2 liang), Gan Cao Jie (Gancao Joints, 1 liang), Di Yu (Sanguisorbae Radix, 1 liang).
Preparation: Finely chop the above herbs. For each dose, take half a liang, add two bowls of water, boil down to one bowl. Divide into two doses, taken morning and evening. Boil the dregs again as one dose. If pus and blood are present, they will be expelled naturally, bringing relief; if pus and blood are retained internally, they will pass through the large intestine; if not yet formed into pus, they will dissipate spontaneously. Avoid all toxic foods. If there is an open sore, apply the following external medicine.
Tong Ming Niu Pi Jiao (Transparent Beef Skin Glue, 1 liang, melted with half a sheng of water), Huang Dan (Lead Tetroxide, 1 liang, added to the glue and boiled for three to five times).
Preparation: Allow to cool to a lukewarm temperature. Apply to the sore mouth using a chicken feather. Open sores will heal and close; swelling that has not yet formed an ulcer will resolve internally. During the Yuanfeng era, Chancellor Wang Anshi developed a back carbuncle. Medical treatments were ineffective. He gradually became confused and unconscious, with a critical condition. Liang Yanyi, Magistrate of Shangyuan County and Chaofeng Lang, possessed this medicine, claiming its efficacy was miraculous, but kept the formula secret. Upon obtaining the medicine, Wang Anshi took it and passed about one sheng of foul matter via diarrhea, after which he recovered. He then presented the formula to the Chancellor, from whom I obtained it. For ordinary people taking this medicine, it does not cause severe purgation, but rather expels pus and blood.