此证须分上下，看其斑疹疙瘩与疮。上先见者，上体多者，在上也；下先见者，下体
多者，在下也；上下同得者，在上复在下也。虽有上下道路之殊，然不外乎阳明一经。阳明
胃与大肠之经，无物不受。此风之入人也，气受之，则在上多；血受之，则在下多；气血俱
受者，甚重。自非医者神手，病者铁心，罕有免者夫。或从上，或从下，以渐而来者，皆可
治。病患见其病势之缓，多忽之，失于早治，及至势极，鲜能为矣，良可叹哉！
戴人张子和云∶《内经》论癞风，针二百日，眉毛再生，针同发汗也。但无药者
用针，一汗可抵千针。故高供
奉尝采萍治瘫痪风出汗。张主簿病瘫十余年。戴人曰∶足有汗者可治之，当发汗。其
汗出当臭，其涎当腥。乃置燠室中以三圣散吐之。汗出周身如卧水中，其汗果臭，其痰皆腥
如鱼涎，足心微有汗，次以舟车丸、浚川散下五七行，如此数次乃瘳。
患人身上痒甚，盖为风邪，气郁血不荣。服宜四物汤加黄芩、白芷，调浮萍末服，发
汗而愈。
经曰∶汗之则疮已。况癞之为风，尤疮之最恶者，故曰厉风。诸疮热入，热则生风，
又况厉风，尤染肃杀之风而成者。若非汗法，何以去其厉风？所以汗之一法，治厉之最要者。
其余诸方次第用之可也。
这种病症必须区分病位的上下，观察斑疹疙瘩与疮疡的表现。如果症状先在身体上部出现，或者在上部表现较多，说明病位在上；如果症状先在身体下部出现，或者在下部表现较多，说明病位在下；如果上下同时出现，说明病位既在上又在下。虽然病邪入侵的途径有上下的不同，但总归离不开阳明经这一条经络。阳明胃经与大肠经，无所不纳。风邪侵入人体，如果气分受邪，则病变多在上部；如果血分受邪，则病变多在下部；如果气血都受邪，病情就非常严重。如果不是医生手法高明，病人意志坚定，很少能免于死亡啊。无论是从上往下发展，还是从下往上发展，只要是逐渐出现的，都是可以治疗的。患者看到病势缓和，往往忽视它，错过了早期治疗的机会，等到病势发展到极点，就很少能救治了，真是令人叹息啊！
戴人张子和说：《内经》论述癞风（麻风病），针刺二百天，眉毛可以再生，针刺的作用同于发汗。只是在没有药物可用时使用针刺，一次发汗的效果可以抵得上千次针刺。所以高供奉曾经采集浮萍来治疗瘫痪风并使其出汗。张主簿患有瘫痪症十多年。戴人说：“脚上有汗的可以治疗，应当发汗。”他的汗出应该带有臭味，他的唾液应该带有腥味。于是将他安置在温暖的密室中，用三圣散进行催吐。汗出遍身如同躺在水中，汗水果然有臭味，痰液都像鱼涎一样腥臭，脚心微微出汗，接着用舟车丸、浚川散泻下五到七次，像这样经过几次治疗后才痊愈。
患者身上非常瘙痒，这是因为风邪导致气机郁滞，血液不能濡养肌肤。服用四物汤加黄芩、白芷，调服浮萍末，通过发汗而痊愈。
经文说：发汗则疮疡自愈。何况癞风作为风邪，更是疮疡中最恶劣的，所以称为厉风。各种疮疡热毒内入，热极则生风，更何况厉风，更是由肃杀之风感染而成的。如果不是用发汗法，怎么能去除这厉风？所以发汗这一方法，是治疗厉风最关键的手段。其余的各种方剂可以依次使用。
This condition must be differentiated by the upper and lower locations, observing the manifestation of macules, papules, and sores. If symptoms appear first in the upper body or are more prevalent there, the pathogen is located above; if they appear first in the lower body or are more prevalent there, the pathogen is located below; if both upper and lower parts are affected simultaneously, the pathogen involves both. Although the pathways of pathogenic invasion differ between upper and lower, it ultimately does not go beyond the Yangming Meridian (Yangming Channel). The Stomach Meridian of Foot-Yangming and Large Intestine Meridian of Hand-Yangming receive everything without exception. When wind pathogens invade the human body, if Qi is affected, lesions tend to occur in the upper part; if Blood is affected, lesions tend to occur in the lower part; if both Qi and Blood are affected, the condition is severe. Unless the physician possesses divine skill and the patient has an iron will, few can escape death. Whether progressing from above or from below, as long as it develops gradually, it is treatable. Patients often neglect the illness when they perceive the slow progression, missing the opportunity for early treatment. By the time the condition reaches its extreme, few can be saved, which is truly lamentable!
Zihe, Dai Ren (Zhang Zhongjing's contemporary, Zhang Zihé), stated: "The *Neijing* discusses Leprosy (Lai Feng, a term historically used for various chronic skin diseases including leprosy), stating that acupuncture over two hundred days can cause eyebrows to regrow. Acupuncture serves similarly to inducing sweating." However, when herbs are unavailable, acupuncture is used; one instance of induced sweating can equal the effect of a thousand acupuncture sessions. Therefore, Gao Gongfeng once used *Pingyi* (Mikania scandens) to induce sweating in patients with paralysis-wind. Magistrate Zhang suffered from paralysis for over ten years. Dai Ren said, "If there is sweat on the feet, it is treatable; sweating should be induced." His sweat would have a foul odor, and his saliva would have a fishy smell. He was placed in a warm chamber, and *Sansheng San* (Three Holy Powders) was administered to induce vomiting. Sweat poured all over his body as if he were lying in water; the sweat indeed smelled foul, and the phlegm was as fishy as fish mucus. There was slight sweating on the soles of the feet. Subsequently, *Zhouche Wan* (Boat Cart Pill) and *Junchuan San* (River Dredging Powder) were used to purge five to seven times. After several such treatments, he recovered.
Patients suffering from intense itching on their bodies are afflicted by wind pathogens causing Qi stagnation and Blood failing to nourish the tissues. They should take *Siwu Tang* (Four Substances Decoction) added with *Huangqin* (Scutellariae Radix) and *Baizhi* (Angelicae Dahuricae Radix), mixed with *Pingyi* (Mikaniae Scandentis Herba) powder, and take it to induce sweating until cured.
The Classics state: "Inducing sweating cures sores." Moreover, since Leprosy is a type of wind disease and is the most malignant among sores, it is called Li Feng (Severe Wind). In various sores, heat enters internally; excessive heat generates wind. Furthermore, Li Feng is formed by contracting killing/cold winds. Without the method of inducing sweating, how can this Severe Wind be expelled? Therefore, the method of inducing sweating is the most crucial treatment for Li Feng. Other formulas may be used sequentially thereafter.