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The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states: Wind pathogen (*Feng Xie*) enters together with the Taiyang channel (*Taiyang Jing*), travels through the Shu points of various meridians, and scatters between the muscle layers (*Fenrou*). It interferes with the Wei Qi (*Defensive Qi*), causing obstruction in its pathways, thus leading to sores in the muscles. When Wei Qi stagnates and fails to circulate, the flesh becomes insensible (*Bu Ren*, numbness). Li Feng (*Li Feng*, a severe dermatological condition equivalent to modern leprosy) occurs when Ying Qi (*Nutritive Qi*) and Wei Qi are excessively hot, and the internal qi is impure, resulting in the collapse of the nasal bridge, deterioration of complexion, and ulceration of the skin. When cold and wind pathogens lodge in the vessels and do not depart, it is named Li Feng.

The syndrome of Li Feng is what is currently referred to as "Da Feng" (Great Wind) or "Lai Feng" (Leprosy), actually caused by the reception of lethal winds from heaven and earth. The ancients called it "Li" because the pathogen is fierce, violent, and terrifying.

What is recorded in the *San Yin Ji Bing Fang Lun* (Treatise on the Three Causes of Disease) corresponds to the "evil disease" mentioned in the *Suwen: Feng Lun* chapter. Although named "Wind," it is not necessarily caused solely by external wind invasion. Generally, it arises mostly from excessive desires and physical labor, leading to qi and blood stagnation transforming into heat; or after sweating, when pores are open, one fails to avoid wind, cold, and damp pathogens, allowing pernicious qi to interfere with Wei Qi, causing muscle and skin ulceration and nasal collapse. As stated in the *Qianjin Fang* (Essential Prescriptions Worth a Thousand Gold), this is self-inflicted impropriety, engaging in extremely vile acts; although there may be words of regret, there is no heart of repentance, which indeed reflects the reality. However, there are also cases transmitted via contagion. Investigating the etiology, some involve neither internal nor external factors, while others result from transmission. Treatment must deduce the specific cause. Cases involving wind, cold, damp-heat combined with labor, diet, and those caused by contagion are distinctly different. If all are treated uniformly as Li Feng, it would be an error.

The cause of contagion affects only those with accumulated internal heat and toxins. Just as dryness meets fire and burns first, this too cannot be denied as wind-pathogen pathology.

Li Feng has five types. Huang Feng (Yellow Wind) generates yellow worms; Qing Feng (Green Wind) generates green worms; Chi Feng (Red Wind) generates red worms; Bai Feng (White Wind) generates white worms; Hei Feng (Black Wind) generates black worms. Only the black worm-induced disease is incurable. These worms reside in the patient's body, moving endlessly, even penetrating to the bone marrow. If they consume the liver, eyebrows fall out; if they consume the lungs, the nasal bridge collapses; if they consume the spleen, speech becomes scattered; if they consume the kidneys, tinnitus sounds like thunder; if they consume the heart, various pains and sores erupt. Since the Heart governs these manifestations, damage to the Heart leads to death.

However, this disease is not limited to the Lung organ. Because the symptoms manifest in the nose, it is colloquially called Lung Wind (*Fei Feng*). Nasal swelling and redness at the root, enlarging into sores, occur because blood follows the transformation of qi. When qi fails to distribute properly, blood accumulates. Once blood accumulates, flesh rots and worms are generated. Worms are governed by the Jueyin Liver Channel (*Jueyin Gan Jing*). Jueyin belongs to Wind-Wood and governs the generation of the five worms. This is likely due to excessive Fire of the Triple Burner (*Sanjiao*) suppressing Metal (*Jin*); when Metal is weak, Wood evil prevails and insults Metal. It is appropriate to use formulas that vent fire pathogen and promote qi circulation, so that worms will naturally not arise. Thus, this disease is clearly identified as Blood Heat (*Xue Re*). In the initial stage, one should employ dispersing and purging methods, decocting Shengma Tang (*Cimicifugae Decoction*) from the *Taiping Huimin Heji Jufang* (Formulas of the Bureau for the Care of the People), and administering Qian Shi's Xieqing Wan (*Draining Green Pill*). Other diseases should be treated according to their respective meridians.