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The *Feng Lun* (Treatise on Wind) states: Wind qi enters together with the Taiyang channel, circulates through the Shu points of various channels, and scatters between the muscle layers. It interferes with Wei Qi (Defensive Qi), obstructing its pathways, thus causing muscles to swell and form sores. When Wei Qi coagulates and fails to circulate, the flesh becomes insensible. Li Feng (Leprosy) occurs when Ying Qi (Nutritive Qi) is heated and impure, leading to the collapse of the nasal bridge, deterioration of complexion, and ulceration of the skin. When wind-cold lodges in the vessels and does not depart, it is named Li Feng. Some call it Han Re (Cold-Heat).

The *Chang Ci Jie Lun* (Treatise on Long Punctures) states: In cases of severe wind disease, where joints feel heavy and eyebrows/beards fall out, it is called Da Feng (Great Wind). Treatment involves puncturing the muscles until sweating occurs, for one hundred days. If puncturing reaches the bone marrow, sweating should also occur for one hundred days; after a total of two hundred days, once eyebrows and beards regrow, needling should cease. For patients with Li Feng, frequent puncturing should be performed above the swelling. After initial puncture, a sharp needle is used at the site to press out evil qi, stopping only when the swelling completely subsides. One should consume only their usual diet and avoid other foods.

The *Mai Yao Jing Wei Lun* (Essential and Subtle Discourse on Pulse Diagnosis) states: When the pulse is altered by wind, it results in Li Feng.

Li Feng is synonymous with Da Feng. It is also called Lai Feng. The common people refer to it as Da Ma Feng (Big Leprosy). Although this disease is named "wind," it is actually not caused by exogenous wind pathogens. Rather, it stems from yin, harsh, turbid, and evil pathogens in the world. These may transform into wind-heat generating parasites due to Wood-Wind influence, or damp-toxins affecting the skin and hair before spreading to Ying and Wei systems. Contact with unclean substances or contagion can also generate parasites. Parasites are governed by the Jueyin Liver, which belongs to Wind-Wood and governs the generation of five types of parasites. Initially, the emergence of parasites is unnoticed, but over time they multiply, becoming incurable. This is indeed the most malignant, dangerous, and disfiguring syndrome. Furthermore, the *Qian Jin Fang* (Prescriptions Worth a Thousand Gold) states that this results from extremely unrighteous and heinous deeds, making it particularly difficult to treat. Observing Sun Simiao's words: "I have treated hundreds of patients, yet not one survived." This is likely because no one could adhere to dietary and behavioral taboos. Only one woman recovered fully after taking more than a hundred doses of Ji Jian Si Wu Tang (Modified Four Substance Decoction) for over half a year, allowing her menstruation to resume normally. Similarly, Zhu Danxi treated five patients, and only one woman survived because she was extremely poor and widowed, lacking access to prohibited foods. The other three or four patients relapsed after two or three years and died. From this, it is evident that without extraordinary secret prescriptions, efficacy is rare. Therefore, when I encounter such cases, I dare not pretend to expertise or prescribe recklessly, nor do I dare to forcefully advocate specific treatments to confuse future generations. Regarding ancient methods of treatment, they are quite detailed. If applied appropriately, although the root cause may not be entirely eradicated, life expectancy can be extended, and premature death avoided. Having searched extensively through various texts, I find that Xue Lizhai’s *Li Yang Ji Yao* (Key Essentials for Leprosy and Ulcers) provides the most comprehensive discussion. Here, I select its essential points along with other rational theories, detailing them below as a guideline for syndrome differentiation and treatment.