围，毒炽甚矣。若烂见心，透膜犯主，神手医救亦难。余以为初起莫妙于灸，中间
莫妙于熏，若有腐而不溃，白降红升提腐去毒，俟毒尽肌生之时，再行生肌，自无锁口之患。（《青囊》）
汪省之曰∶凡辨发背，令患者以两手上下摸看，搭不着着方是发背。若搭的着
者，上为上搭，下为下搭，左为左搭，右为右搭，中为中搭，俱以手搭治之。若手
摸不着，则是真正发背，必须内外相参，上紧医救，方可保其无变也。（《理例》）
陈实功曰∶心之以上多危险者，因属于五脏故也。盖心肝脾肺四脏，皆系于背，
惟肾经一脏，独居于下，虽居于下，其本脏精华津液，元气元神，尽行灌溉荣注于
上，故四脏之火，皆赖一脏之水以济之，所谓五脏根本，皆系于背，即此之义也。况
背乃太阳膀胱、督脉所主，太阳者，乃六经之首领，督脉者，十二经络之统脉，疮
生于背，毒犯于此，须分阴阳虚实治之。（《正宗》）
又曰∶发背在心之以下，肾俞以上者轻，因属于腑分，故曰心之以下多成顺，盖
其形在下，其气主表，其病为痈。（《正宗》）
汪省之曰∶癌发生于神道、灵台二穴，乃督脉、膀胱经。初起时不作寒热疼痛，紫
黑色，不破里而先自黑烂，二十岁以后，房劳积热所生，皮黑者不治。（《理例》）
胡公弼曰∶对心发、蜂窠发、莲子发、两头尖皆发背之别名，以疮口开张深浅而
言也。此证最忌香蕈、烧酒，猪、羊、牛、驴等肉，前后切忌寒凉之剂，以免毒攻内陷。（《青囊》）
疮口周围红肿范围大，说明毒邪炽盛。如果腐烂深达心脏部位，穿透膜络侵犯内脏，即使是神医也难以救治。我认为初起时没有比艾灸更好的方法，中期没有比熏法更好的方法；如果有腐肉但不溃破，可用白降丹和红升丹提脓祛腐，等到毒邪排尽、新肉生长之时，再行生肌敛疮，自然就不会出现锁口疮的祸患。（《青囊》）
汪省之说：凡是辨别发背病，让患者用双手上下触摸查看，摸不到的地方才是发背。如果能摸到的，位于上方叫上搭，下方叫下搭，左边叫左搭，右边叫右搭，中间叫中搭，都可以用手按摩治疗。如果手摸不到，那就是真正的发背，必须内外兼治，抓紧抢救，才可以保证不发生变证。（《理例》）
陈实功说：在心脏对应背部以上的部位发病多危险，因为归属于五脏的缘故。大概心、肝、脾、肺四脏，都系联于背部，只有肾经这一脏，独自居于下部，虽然居于下部，但其本脏的精华津液、元气元神，全部灌溉荣注于上部，所以四脏的火气，都依赖这一脏的水气来济助，这就是所谓五脏的根本，都系联于背部的含义。况且背部是足太阳膀胱经（Taiyang Bladder Meridian）和督脉（Du Mai, Governor Vessel）所主管的部位，太阳经是六经之首领，督脉是十二经络的统率经脉，疮疡生于背部，毒邪侵犯于此，必须分辨阴阳虚实来治疗。（《正宗》）
又说：发背发生在心脏对应背部以下、肾俞穴以上部位的病情较轻，因为归属于腑的分野，所以说心脏对应背部以下多形成顺证，因为其形态在下部，其气机主表，其病症属于痈。（《正宗》）
汪省之说：癌发生于神道穴（Shendao, GV11）和灵台穴（Lingtai, GV10）两个穴位，涉及督脉和膀胱经。初起时不伴有寒热疼痛，呈现紫黑色，不向内部破溃而先自行黑烂，这是二十岁以后因房事劳累积热所生，皮肤发黑的无法治愈。（《理例》）
胡公弼说：对心发、蜂窠发、莲子发、两头尖都是发背的别名，是根据疮口开张深浅而言的。此证最忌讳食用香蕈、烧酒，猪、羊、牛、驴等肉类，前后阶段切忌使用寒凉药剂，以免毒邪攻陷内入。（《青囊》）
The swelling around the wound is extensive, indicating that the pathogenic toxin is extremely intense. If the ulceration penetrates to the level of the heart and invades the internal organs through the membranes, even a divine physician would find it difficult to save the patient. I believe that moxibustion (Moxibustion) is the best method in the initial stage, fumigation is the best method in the intermediate stage; if there is necrotic tissue but no suppuration, Baixiang Dan (White Reduction Elixir) and Hongsheng Dan (Red Ascension Elixir) should be used to extract pus and remove necrosis. Wait until the toxin is exhausted and new flesh grows, then proceed with generating muscle and healing the wound, thereby avoiding the complication of "locking mouth" (a type of stubborn ulcer). (Qingnang)
Wang Shengzhi said: To distinguish Fa Bei (Back Carbuncle), ask the patient to use both hands to feel up and down. The area that cannot be touched by hand is Fa Bei. If it can be touched, it is classified as Upper Da (Upper Attachment), Lower Da (Lower Attachment), Left Da (Left Attachment), Right Da (Right Attachment), or Middle Da (Middle Attachment), all of which can be treated with manual massage. If it cannot be touched by hand, it is a true Fa Bei, requiring simultaneous internal and external treatment and urgent medical intervention to prevent complications. (Lili)
Chen Shigong said: Lesions above the back region corresponding to the Heart are dangerous because they belong to the Zang organs. Generally, the Heart, Liver, Spleen, and Lung are connected to the back, whereas the Kidney meridian resides alone in the lower part. Although located inferiorly, its essence, fluids, Yuan Qi (Original Qi), and Shen (Spirit) irrigate and nourish the upper body. Thus, the fire of the four Zang organs relies on the water of this one organ for balance. This explains why the root of the five Zang organs is associated with the back. Moreover, the back is governed by the Taiyang Bladder Meridian (Taiyang Bladder Meridian) and the Du Mai (Governor Vessel). The Taiyang channel is the leader of the Six Channels, and the Du Mai is the commander of the Twelve Meridians. When sores occur on the back and toxins invade this area, treatment must differentiate between Yin and Yang and Deficiency and Excess. (Zhengzong)
He also said: Fa Bei occurring below the back region corresponding to the Heart and above the Shenshu point (Shenshu, BL23) is mild because it belongs to the Fu organ domain. Therefore, lesions below the Heart region often present as favorable conditions (Shun Zheng), as their form is inferior, their Qi governs the exterior, and their pathology is an abscess (Yong). (Zhengzong)
Wang Shengzhi said: Cancer (referring here to a specific severe ulcerative condition, not necessarily modern carcinoma) occurs at the Shendao point (Shendao, GV11) and Lingtai point (Lingtai, GV10), involving the Du Mai and the Bladder Meridian. In the early stage, there is no aversion to cold, fever, or pain; the lesion appears purple-black, does not rupture internally but turns black and necrotic spontaneously. It arises from accumulated heat due to sexual exhaustion after the age of twenty. Cases with black skin are incurable. (Lili)
Hu Gongbi said: Dui Xin Fa (Opposite Heart Eruption), Feng Ke Fa (Honeycomb Eruption), Lian Zi Fa (Lotus Seed Eruption), and Liang Tou Jian (Two-Pointed Tip) are all alternative names for Fa Bei, distinguished by the depth and opening of the sore. This condition strictly forbids the consumption of shiitake mushrooms, distilled liquor, and meats such as pork, mutton, beef, and donkey meat. Throughout the course of the disease, cold-natured medicines must be avoided to prevent the toxin from sinking inward. (Qingnang)