夫分经用药。当知气血多少。多则易愈。少则难痊。疮科之医。明此大理。不致有犯禁颓
败坏逆之失也。如手少阳三焦经。手少阴心经。手太阴肺经。足少阳胆经。足少阴肾经。
足太阴脾经。此六经皆多气少血。凡有疮疡。最难收口。如手厥阴心胞络经。手太阳小肠
经。足太阳膀胱经。足厥阴肝经。此四经皆多血少气。凡有疮疡。宜托里。手阳明大肠经。
足阳明胃经。此二经气血俱多。初宜内消。终则收功易得。故表此。不可一概而论治哉。
天地有六淫之气。乃风寒暑湿燥火。人感受之则营气不从。逆于肉理。变生痈肿疔疖。
其脉现于人迎。必浮大洪数。其疮肿 于外。恐邪气极而行。治宜托里。经云。汗之则疮
已。使营卫通行。邪气不得入于里也。人有七情。喜怒忧思惊恐悲。有一伤之。脏腑不和。
营气不从。逆于肉理。则为痈肿。外无 赤。其痛深于内。其脉沉实而数。必发热烦躁。
治必疏通脏腑。以绝其源是也。如不内外因者。或膏粱之人。
受用太过。或素禀偏性。或劳逸太苦。致令津液稠粘。痰涎壅塞。隧道不通。外无形症。
内无便溺之阻。饮食如故。清便自调。其脉必滑数实大。知邪在经。当和荣卫。调其经络。
不失于常。此三法得宜。虽未速瘥。其邪亦峻减。而疮亦不致于坏也。
在治疗疮疡时，应当根据经络来用药。必须了解各条经络中气血的多少情况：气血多的经络，疮疡容易痊愈；气血少的经络，则难以治愈。从事外科的医生，如果明白这一大道理，就不会犯下导致病情败坏、出现逆证等禁忌性的错误。
例如，手少阳三焦经、手少阴心经、手太阴肺经、足少阳胆经、足少阴肾经、足太阴脾经，这六条经络都是多气少血。凡是这些经络发生疮疡，最难收口愈合。
又如，手厥阴心包络经、手太阳小肠经、足太阳膀胱经、足厥阴肝经，这四条经络都是多血少气。凡是这些经络发生疮疡，治疗适宜采用“托里”法（即补益正气，托毒外出）。
再如，手阳明大肠经、足阳明胃经，这两条经络气血都很多。初期适宜采用“内消”法（使疮疡在内部消散），最终则容易收功愈合。因此列出这些原则，不可一概而论地进行治疗。
天地之间有六种淫邪之气，即风、寒、暑、湿、燥、火。人体感受了这些邪气，就会导致营气运行不畅，逆乱于肌肉纹理之间，从而变生痈肿、疔疮、疖子。此时脉象会在人迎穴处显现，必定是浮、大、洪、数的脉象。疮疡肿胀表现在外部，恐怕是因为邪气极盛而流行所致，治疗适宜采用托里法。医经说：“发汗则疮疡可愈。”这是为了使营卫之气通行，防止邪气深入体内。
人有七种情志，即喜、怒、忧、思、惊、恐、悲。其中任何一种情志过度损伤身体，都会导致脏腑功能不和，营气运行不畅，逆乱于肌肉纹理之间，从而形成痈肿。这种痈肿外部没有明显的红肿，但疼痛深在于内部，脉象沉实而数，必定伴有发热和烦躁不安的症状。治疗必须疏通脏腑，以断绝病源。
至于不内外因导致的疾病，比如那些饮食肥甘厚味的人，享受太过；或者素来体质偏颇；或者劳逸过度，导致津液变得粘稠，痰涎壅塞，经络通道不通。这种情况下，外部没有明显的症状，内部也没有大小便的阻滞，饮食正常，二便调和。其脉象必定滑、数、实、大。知道邪气在经络之中，应当调和营卫，调理经络，使其恢复常态。这三种治疗方法如果运用得当，虽然不能迅速痊愈，但邪气也会大大减弱，疮疡也不会导致败坏。
When treating sores and ulcers, medication should be administered according to the meridians. It is essential to understand the abundance or scarcity of Qi and Blood in each meridian: sores on meridians with abundant Qi and Blood are easier to heal, whereas those on meridians with scarce Qi and Blood are difficult to cure. Physicians specializing in surgery must comprehend this fundamental principle to avoid committing errors that lead to deterioration or adverse conditions (Ni Zheng), which are contraindicated.
For instance, the Hand Shaoyang Sanjiao Meridian, Hand Shaoyin Heart Meridian, Hand Taiyin Lung Meridian, Foot Shaoyang Gallbladder Meridian, Foot Shaoyin Kidney Meridian, and Foot Taiyin Spleen Meridian all possess abundant Qi but scarce Blood. Sores occurring in these six meridians are the most difficult to close and heal.
Conversely, the Hand Jueyin Pericardium Meridian, Hand Taiyang Small Intestine Meridian, Foot Taiyang Bladder Meridian, and Foot Jueyin Liver Meridian all possess abundant Blood but scarce Qi. For sores in these four meridians, treatment should preferably employ the "Tuo Li" method (supporting the interior and expelling toxins).
The Hand Yangming Large Intestine Meridian and Foot Yangming Stomach Meridian both have abundant Qi and Blood. Initially, it is suitable to use the "Nei Xiao" method (internal resolution) to dissipate the sore internally, making final healing relatively easy. Therefore, these distinctions are outlined; one cannot apply a uniform treatment approach indiscriminately.
The Heaven and Earth possess six types of pathogenic influences (Liu Yin): Wind, Cold, Summerheat, Dampness, Dryness, and Fire. When the human body contracts these pathogens, Ying Qi (Nutritive Qi) fails to flow smoothly and becomes reversed within the muscle tissue, leading to the generation of carbuncles, sores, boils, and furuncles. The pulse at the Renying acupoint will manifest as Floating, Large, Surging, and Rapid. With swelling visible externally, it is feared that the pathogenic qi is extreme and spreading; treatment should favor supporting the interior. The classics state, "Sweating will cure the sore." This aims to facilitate the circulation of Ying and Wei (Defensive) Qi, preventing pathogens from penetrating inward.
Humans have seven emotions: Joy, Anger, Worry, Thought, Fright, Fear, and Sorrow. Excessive indulgence in any of these can disrupt Zang-Fu organ harmony, causing Ying Qi to stagnate and reverse in the muscle tissue, resulting in carbuncles. These external manifestations lack redness, but the pain is deep-seated internally. The pulse is Deep, Solid, and Rapid, accompanied by fever and irritability. Treatment must focus on unblocking the Zang-Fu organs to eliminate the source.
Regarding causes that are neither internal nor external, such as individuals consuming excessive rich and greasy foods, inherent constitutional biases, or excessive labor and rest imbalances, these factors cause body fluids to become viscous and phlegm-saliva to obstruct the meridians. In such cases, there are no obvious external symptoms, nor internal obstruction of urination or defecation; diet remains normal, and excretions are regular. The pulse is typically Slippery, Rapid, Solid, and Large. Knowing the pathogen resides in the meridians, one should harmonize Ying and Wei Qi and regulate the meridians to restore normalcy. If these three therapeutic methods are applied appropriately, although rapid recovery may not occur, the pathogenic influence will be significantly reduced, and the sore will not deteriorate.