麦饭石膏治背疽之疾，神妙莫比，惜乎世人罕有能知者。然古方所载用药制度，略而不
详，则其间药材不真，修制苟简，是自致其无验，非方之误也。愚亲见一贵人有此疾，医者
用麦饭石膏涂贴，不惟无效，又且添痛楚；更以毒药 之，脓亦不溃，昼夜终痛，不得安寝。
疮逐日开大，浸至两胁，又于咽喉、脚膝间遍发数疽，医者尽以为不可治疗。愚虽预备此
药，选择修制，既良且精，而未敢便用。俟诸药缩手，试以用之，一夕之间，疼痛尽止，脓血俱
溃，来如湍水，病者安寝。众皆惊愕，以谓别有神药，殊不察止于麦饭石膏也。疽疾须得脓血
溃散之多，即使毒瓦斯随脓血出，不至内伤脏腑，病者得安。有一庸医，见脓不溃，遂打两锡
管，欲插入疽，以口汲出其脓。愚谓∶用此则病
者必不可救！力沮其说。又用荐席开其一窦，使病者仰卧以取脓, 此说不可谏，因令试之,
脓亦不来。后卒用愚所合麦饭石膏而取效。自此而后，乡闾有此疾者，来下问，因录此方，俾
精择修合，尽取十全之功，愚故详着之。
一、痈疽初作之时，便合用麦饭石膏四围涂敷，以护其根脚，不可使开，中心却要留痈
口如钱大，使毒瓦斯出。如痈渐小，随其大小敷之。直候疽破脓溃之后，口收止犹径寸许，用
神异膏点敷收住，却用麦饭石膏。
神异膏 治一切疮疥（按∶此方原缺，今从危亦林《得效方》补入）
全蝎(七个，去毒) 皂角(一锭，锉碎) 巴豆(七粒，去壳) 蛇床子(三钱) 清油(一两) 黄蜡(半两) 轻
粉(半匙) 雄黄(别研，三饯)
上先用皂角、全蝎、巴豆煎油变色，去了三味，入黄蜡化开，取出冷处，入雄黄、蛇床
末、轻粉，和匀成膏。先用苦参汤温洗后，以药擦疮疥上，神效。
又∶神异膏（此方从《赤水元珠》补入）
黄 杏仁 元参（各一两）
上用麻油二斤，煎至将黑，加蛇脱五钱，蜂房一两，男子发一团如鸡子大，再煎至黑，
去滓，徐徐下黄丹，不拘多少，得中为度，文武火熬收。
麦饭石膏治疗背疽这种疾病，效果神奇无比，可惜世人很少有人知道。然而古方中记载的用药剂量和炮制方法，简略而不详细，导致药材不纯正，制作粗糙简陋，这是自己导致无效，并非药方的错误。我亲眼见到一位贵人患此病，医生用麦饭石膏涂抹贴敷，不仅没有疗效，反而增加了痛苦；又用毒药腐蚀它，脓液也不溃破，昼夜疼痛，无法安睡。疮口逐日扩大，蔓延至两胁，又在咽喉、脚膝间遍发数个疽，医生们都认为不可治疗。我虽然预备了此药，精心选择并严格炮制，既优良又精细，但不敢立即使用。等到其他药物都束手无策时，尝试使用它，一夜之间，疼痛完全停止，脓血全部溃排，流出如急水般，病人得以安睡。众人都感到惊愕，以为另有神药，完全没有察觉只是麦饭石膏罢了。疽疾必须让脓血大量溃排，即使毒气随脓血排出，不至于内伤脏腑，病人才能得安。有一个庸医，见脓不溃破，于是打了两根锡管，想要插入疽中，用口吸出脓液。我认为：使用这种方法病人必定无法救治！极力阻止这个说法。又有人建议用草席开一个洞，让病人仰卧以引出脓液，这个说法也无法劝阻，于是让他尝试，脓液也没有出来。后来最终用了我所调配的麦饭石膏才取得疗效。从此以后，乡里有患此病的人来询问，因此记录此方，使人们精心选择并配合制作，力求达到十全的效果，所以我详细地记录下来。
一、痈疽刚开始发作时，就应当用麦饭石膏在四周涂敷，以保护其根部根基，不可使其扩散，中心却要留出如铜钱大小的痈口，使毒气排出。如果痈肿逐渐变小，随之调整大小进行敷贴。一直等到疽破溃排脓之后，疮口收缩到仍有一寸左右直径时，用神异膏点涂敷贴以收敛疮口，然后再用麦饭石膏。
神异膏 治疗一切疮疥（按：此方原缺，现在从危亦林《得效方》补入）
全蝎（七个，去毒） 皂角（一锭，锉碎） 巴豆（七粒，去壳） 蛇床子（三钱） 清油（一两） 黄蜡（半两） 轻粉（半匙） 雄黄（单独研磨，三钱）
以上先用皂角、全蝎、巴豆煎油至变色，去掉这三味药，加入黄蜡化开，取出放在冷处，加入雄黄、蛇床子末、轻粉，混合均匀成膏。先用苦参汤温洗后，将药擦在疮疥上，效果神奇。
另外：神异膏（此方从《赤水元珠》补入）
黄柏 杏仁 玄参（各一两）
以上用麻油二斤，煎至颜色变黑，加入蛇蜕五钱，蜂房一两，男子头发一团如鸡蛋大，再煎至黑色，去掉药渣，慢慢加入黄丹，不拘多少，适中为度，用文火武火熬制收膏。
Mafan Shigao (Wheat Meal Stone Paste) treats the disease of back carbuncle (back furuncle/abscess), with effects so miraculous that they are beyond comparison. It is a pity that few people in the world know it. However, the dosage and processing methods recorded in ancient prescriptions are brief and not detailed, leading to impure medicinal materials and rough, simplified preparation. This causes ineffectiveness on one's own part, rather than an error in the prescription itself. I personally witnessed a nobleman suffering from this disease. The physician applied Mafan Shigao for topical application, which was not only ineffective but also increased pain; furthermore, caustic drugs were used to corrode it, yet pus did not discharge, causing day-and-night pain and preventing rest. The wound expanded daily, spreading to both flanks, and several carbuncles appeared all over the throat, feet, and knees. Physicians all considered it untreatable. Although I had prepared this medicine, carefully selected and strictly processed it to be excellent and refined, I dared not use it immediately. Waiting until other medicines failed, I tried using it. Within one night, the pain ceased completely, pus and blood discharged profusely like rushing water, and the patient slept peacefully. Everyone was astonished, believing it to be another divine medicine, without realizing it was merely Mafan Shigao. For carbuncle diseases, it is necessary to have abundant discharge of pus and blood, so that even if toxic factors exit with the pus and blood, internal damage to the Zang-Fu organs is avoided, allowing the patient to recover. A mediocre physician, seeing that pus did not discharge, drilled two tin tubes intending to insert them into the carbuncle and suck out the pus with his mouth. I stated: Using this method, the patient certainly cannot be saved! I strongly opposed this idea. Another suggestion was to make a hole in a straw mat, allowing the patient to lie supine to drain the pus. This advice could not be dissuaded, so I allowed him to try, but no pus came out. Later, my prepared Mafan Shigao finally achieved efficacy. Since then, villagers suffering from this disease came to ask about it. Therefore, I recorded this prescription, urging careful selection and compounding to achieve complete success, which is why I have detailed it here.
1. When a carbuncle or furuncle first appears, Mafan Shigao should be applied around the periphery to protect its base/root, preventing spread, while leaving a coin-sized opening in the center to allow toxic factors to exit. If the swelling gradually subsides, adjust the application size accordingly. Continue until after the carbuncle ruptures and pus discharges, when the wound shrinks to about one cun in diameter. At this point, apply Shenyi Gao (Divine Miracle Ointment) topically to promote healing and contraction, followed by Mafan Shigao.
Shenyi Gao (Divine Miracle Ointment) Treats all types of skin sores and scabies (Note: This formula was originally missing; added now from Wei Yilin's *Defang Fang*).
Scorpio (Quanxie, 全蝎) (7 pieces, remove venom)
Gleditsia Sinensis Fruit (Zaojiao, 皂角) (one piece, crushed)
Croton Seed (Badou, 巴豆) (7 kernels, remove shell)
Cnidium Monnieri Fruit (Shechuangzi, 蛇床子) (3 qian)
Clear Sesame Oil (Qingyou, 清油) (1 liang)
Beeswax (Huangla, 黄蜡) (0.5 liang)
Calomel (Qingfen, 轻粉) (half spoon)
Realgar (Xionghuang, 雄黄) (separately ground, 3 qian)
First, decoct Gleditsia Sinensis Fruit, Scorpio, and Croton Seed in oil until the color changes, then remove these three ingredients. Add Beeswax and melt it. Take out and place in a cool area. Add Realgar, Cnidium Monnieri Fruit powder, and Calomel, mix evenly to form an ointment. First wash with Sophora Flavescens Decoction (Kushen Tang, 苦参汤) warm, then rub the medicine onto the sores/scabies. It is highly effective.
Additionally: Shenyi Gao (This formula added from *Chuishui Yuanzhu*)
Phellodendron Bark (Huangbai, 黄柏)
Apricot Kernel (Xingren, 杏仁)
Scrophularia Root (Yuanshen/Xuanshen, 元参/玄参) (each 1 liang)
Use 2 jin of Sesame Oil, decoct until dark black. Add 5 qian of Snake Slough (Shetuo, 蛇蜕), 1 liang of Honeycomb (Fengfang, 蜂房), and a ball of human hair (from a male) the size of a chicken egg. Decoct again until black. Remove dregs. Slowly add Lead Tetroxide (Huandan, 黄丹), amount unspecified, until consistency is moderate. Simmer over mild and strong heat to collect the ointment.