此由寒气客于经络，寒搏于血，血涩不通，壅结成疽。腑脏热不泄，热入大小肠，故大
小便不通也。
夫痈发于背者，多发于诸腑俞也。六腑不和则生痈，诸腑俞皆在背，其血气经络周于身
，腑气不和，腠理虚者，经络为寒所客，寒折于血，则壅不通，故结成痈，发其俞也。热气
加于血，则肉血败化，故为脓。痈初结之状，肿而皮薄以泽。
又云∶背上忽有赤肿而头白，摇之连根，入应胸里动，是痈也。
又，发背若热，手不可得近者，内先服王不留行散，外摩发背膏大黄贴。若在背生，破
无苦，良久不得脓，以食肉膏、散着瓮头，内痈口中。人体热气歇，服术散。五日后痈欲瘥
者，服排脓内塞散。
此由寒气客于经络，折于血气，血涩不通，乃结成痈发背。痈脓出之后，眼白睛青黑而
眼小，一逆也；内药而呕，二逆也；腹痛渴甚，三逆也；膊项中不便，四逆也；音嘶色
脱，五逆也。此等五逆者，皆不可治也。或热或渴，非仓卒而急，可得渐治之也。
凡发背，则热气流入腑脏，脓溃之后，血气则虚，腑脏燥热，渴而引饮，饮冷入肠胃，
则变下利。胃虚气逆，则变呕也。呕逆若遇冷折之，气不通则哕也。
其疮若脓汁不尽，而疮口早合，虽瘥更发，恶汁连滞，则变成 也。
此是寒气客于经络，折于气血，血涩不通，乃结成痈。痈发背后利者，由内热而引饮，
取冷太过，冷入肠胃，故令下利不止。胃虚气逆则变呕。所以然者，脾与胃合，俱象土，脾
候身之肌肉，胃为水谷之海；脾虚则肌肉受邪，胃虚则变下痢。下利不止，气逆，故变呕；
呕而遇冷析，气逆不通，则哕也。
这是由于寒气侵入经络，寒邪与血液搏结，导致血液运行涩滞不通，壅积凝结而成疽。脏腑内的热邪无法宣泄，热邪进入大肠和小肠，因此出现大、小便不通的症状。
凡是痈疮发于背部的，大多发生在各腑的俞穴处。六腑功能不和就会生痈，各腑的俞穴都在背部，人体的血气经络遍布全身，若腑气不和，腠理（皮肤纹理及汗孔）虚弱，经络被寒邪侵袭，寒邪损伤血液，导致气血壅塞不通，从而凝结成痈，发作于相应的俞穴部位。热气加在血液上，就会导致肌肉和血液腐败化脓，所以形成脓液。痈初起时的形态，是局部肿胀且皮肤薄而光亮。
又说：背上突然有红肿且顶端发白，摇动时感觉根部相连，深入胸里随之跳动，这就是痈。
另外，发背疮如果发热严重，手不能靠近的，内服王不留行散，外用摩发背膏和大黄贴敷。如果生在背部，破溃后无妨；如果很久不出脓，用食肉膏或散剂涂在瓮口上，将痈头纳入其中熏蒸。待人体热气消退后，服用术散。五日后若痈疮即将痊愈，服用排脓内塞散。
这是由于寒气侵入经络，折损血气，血液涩滞不通，从而结成发背痈。痈脓排出之后，如果出现眼白睛变青黑且眼睛变小，这是一逆证；服药后呕吐，这是二逆证；腹痛且极度口渴，这是三逆证；胳膊和颈部活动不便，这是四逆证；声音嘶哑、面色枯槁，这是五逆证。这五种逆证，都属于不可治愈的情况。如果是发热或口渴，并非突发急症，可以逐渐治疗。
凡是发背疮，热气会流入脏腑，脓液溃破之后，血气变得虚弱，脏腑干燥有热，导致口渴想喝水，若饮用冷水进入肠胃，就会转变为下利（腹泻）。胃气虚弱且气机上逆，就会转变为呕吐。如果呕吐逆气遇到冷邪遏制，气机不通畅，就会发生呃逆（哕）。
如果疮口的脓汁没有排尽，而疮口过早闭合，虽然看似痊愈但随后复发，恶浊汁液连绵不断，就会变成瘘管（此处原文可能有缺字，通常指瘘或漏）。
这是由于寒气侵入经络，折损气血，血液涩滞不通，从而结成痈。痈发于背部并伴有下利的，是由于体内有热而引水自救，取用冷饮太过，冷气进入肠胃，从而导致下利不止。胃气虚弱气机上逆就会转变为呕吐。之所以这样，是因为脾与胃相表里，都象征土，脾主司身体的肌肉，胃是水谷之海；脾虚则肌肉受邪气侵袭，胃虚则转变为下痢。下利不止，气机上逆，所以转变为呕吐；呕吐遇到冷邪遏制，气逆不通，就会发生呃逆。
This is caused by cold pathogenic factors invading the meridians, where cold condenses with blood, causing blood flow to become sluggish and obstructed, leading to stagnation and accumulation that forms a deep abscess (ju). The heat within the zang-fu organs fails to dissipate; when this heat enters the large intestine and small intestine, it results in the obstruction of both urination and defecation.
When an carbuncle (yong) develops on the back, it often occurs at the Shu points of the six fu organs. Disharmony of the six fu organs gives rise to carbuncles. Since all Shu points of the fu organs are located on the back, and the qi and blood meridians circulate throughout the body, if the qi of the fu organs is disharmonious and the cou li (pores and interstices) are deficient, the meridians are invaded by cold. Cold damages the blood, causing stagnation and obstruction, which condenses into a carbuncle manifesting at its corresponding Shu point. When hot pathogenic factors affect the blood, the flesh and blood undergo putrefaction and transformation into pus. The initial appearance of a carbuncle is characterized by swelling with thin, shiny skin.
It is also stated: If a red swelling suddenly appears on the back with a white head, and shaking it reveals connection to the root with pulsation extending into the chest, this is a carbuncle.
Furthermore, for a back carbuncle that is intensely hot and cannot be touched, one should internally administer Wangbuliuxing San (Polygonatum Seed Powder) and externally apply Fabei Gao (Back Carbuncle Ointment) along with Dahuang Tie (Rhubarb Plaster). If it occurs on the back, rupture is not detrimental. If pus does not form after a long period, apply Shirou Gao or powder to the mouth of a jar and place the carbuncle head inside for fumigation. Once the body's excessive heat subsides, consume Shu San (Atractylodes Powder). After five days, if the carbuncle is nearing resolution, take Painong Neisai San (Pus-Draining and Internal-Sealing Powder).
This condition arises from cold pathogenic factors invading the meridians and impairing qi and blood, causing blood flow to become sluggish and obstructed, thereby forming a back carbuncle. After the pus drains, if the whites of the eyes turn blue-black and the eyes appear small, this is the first adverse sign (ni); vomiting after taking medicine is the second adverse sign; abdominal pain with extreme thirst is the third adverse sign; inability to move the arms and neck is the fourth adverse sign; hoarseness and loss of complexion luster is the fifth adverse sign. These five adverse signs indicate conditions that are incurable. However, if there is merely fever or thirst without sudden urgency, gradual treatment may be effective.
In cases of back carbuncles, heat pathogens flow into the zang-fu organs. After the pus ruptures, qi and blood become deficient, and the zang-fu organs become dry and hot, leading to thirst and desire for drinking. If cold drinks enter the stomach and intestines, they transform into diarrhea (xiali). Deficiency of stomach qi with rebellious qi leads to vomiting. If this vomiting and rebellious qi are constrained by cold, resulting in blocked qi flow, hiccups (yue) will occur.
If the pus within the sore is not completely drained and the wound closes prematurely, although it may seem healed, it will recur. Continuous discharge of foul fluid can transform into a fistula (lou).
This is caused by cold pathogenic factors invading the meridians and impairing qi and blood, causing blood flow to become sluggish and obstructed, thereby forming a carbuncle. When a carbuncle develops on the back accompanied by diarrhea, it is due to internal heat prompting the patient to drink water; excessive consumption of cold beverages causes cold to enter the stomach and intestines, leading to persistent diarrhea. Stomach deficiency with rebellious qi transforms into vomiting. The reason for this is that the spleen and stomach are exterior-interior related and both correspond to Earth. The spleen governs the muscles of the body, and the stomach is the sea of water and grain. Spleen deficiency allows pathogens to invade the muscles; stomach deficiency leads to dysentery/diarrhea. Persistent diarrhea and rebellious qi cause vomiting; if vomiting is constrained by cold, causing blocked rebellious qi, hiccups will occur.