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Leg You Feng (Wandering Wind of the Leg) occurs around the legs, presenting with erythema and swelling resembling clouds, accompanied by heat and pain. This is caused by the interplay and stagnation of Ying-Wei (Nutritive and Defensive Qi) with Wind-Heat pathogenic factors. It is appropriate to use Bian stone (Bian Shi, 砭石) bloodletting therapy and internally administer Shuangjie Tongsheng San (Double-Decoction Holy Unifier Powder).

[Note] This syndrome manifests as sudden erythema and swelling on both the inner and outer aspects of the legs, shaped like piled clouds, accompanied by heat and pain. It is formed by the interplay and stagnation of Ying-Wei Qi with Wind-Heat pathogens. Whenever this syndrome is encountered, first apply Bian stone therapy to release evil blood, then administer Shuangjie Tongsheng San, followed by Danggui Niantong Tang (Angelica Sinensis Decoction for Relieving Pain) to clear and resolve the condition externally. Applying beef slices topically to draw out wind-toxin is also highly effective.

Danggui Niantong Tang (Angelica Sinensis Decoction for Relieving Pain)
Danggui (Radix Angelicae Sinensis), Qianghuo (Rhizoma et Radix Notopterygii), Yinchenhao (Herba Artemisiae Scopariae), Cangzhu (Rhizoma Atractylodis Chinensis, soaked in rice wash water and stir-fried)
Fangfeng (Radix Saposhnikoviae) [each 1 qian], Kushen (Cortex Sophorae Flavescentis), Baizhu (Rhizoma Atractylodis Macrocephalae, stir-fried with soil), Shengma (Rhizoma Cimicifugae) [each 0.7 qian]
Gegen (Puerariae Lobatae Radix), Zexie (Rhizoma Alismatis), Renshen (Radix Ginseng), Zhimu (Cortex Anemarrhenae), Huangqin (Radix Scutellariae), Zhuling (Polyporus) [each 0.5 qian], Huangbai (Cortex Phellodendri) (0.3 qian)
Add two cups of water, decoct until eight-tenths remain, take before meals.

[Formula Song] Danggui Niantong treats Leg You Feng, Qianghuo, Renshen, Er Zhu (Cangzhu and Baizhu), and Shengma; Yichen, Gegen, Gancao, Huangqin, Zhimu, and Huangbai; Kushen, Fangfeng, Zexie, and Zhuling together.
Shuangjie Tongsheng San (See Lip Chufeng section)

Why does Qing Tui Ya Gan (Blue Legs and Gangrenous Gums) arise? It is solely due to the lack of communication between the upper and lower parts. Yang fire blazes upward while Yin cold closes off below, condensing into toxin, thus forming this disease. The blue legs appear cloud-like, dark purple-black like an eggplant; the limbs are weary and stubborn, swollen and hard, making walking difficult. The gangrenous gums present with swollen gingiva oozing foul-smelling blood; if it perforates the cheeks and lips and turns black and rotting, the prognosis is ominous.

[Note] This syndrome is rarely recorded in ancient medical texts by name. Only during the Yongzheng reign was detailed knowledge transmitted from Tao Qilin, a military physician accompanying the troops in the northern region. He stated roughly: In the army, anyone suffering from leg swelling with a blue color must simultaneously develop gangrenous gums; anyone suffering from gangrenous gums with foul bloody discharge must simultaneously develop blue legs. These two conditions arise sequentially. Tracing their origin, it is because the upper part suffers from blazing Yang fire, while the lower part suffers from closed-off Yin cold, leading to a failure of Yin and Yang to communicate between upper and lower. Each forms its own cold or heat, condensing separately to produce this syndrome. Near inland areas, it occasionally occurs; outside the borders, although not very common, among people from inland who newly reside outside the border, nine out of ten suffer from this. This is likely because Chinese people are inherently intolerant to the severe cold outside the border, and furthermore, they inevitably sit or lie on damp ground. Thus, phlegm generated by cold-dampness arises in the lower body, causing blue and swollen legs. The shape resembles cloud patches, the color is dark purple-black like an eggplant, the flesh is tough and hard, hence walking is arduous. Additionally, due to the scarcity of grains outside the border, people consume much beef and mutton. The heat combines with dampness, steaming and stasis-forming in the Stomach. Toxin-fire harasses upward, causing gangrenous gums, with rotten, swollen, and bleeding gingiva. If it perforates the cheeks and lips and rots black, it is a critical sign. Outside the border, it is traditionally believed that only administering horse milk is effective. When Tao Qilin first arrived at the military camp, diagnosing Qing Tui Ya Gan, he only knew to prescribe horse milk; after extensive experience, he realized that the power of horse brain is twice as fast-acting as horse milk. He ordered patients to take it, and that night they could sweat profusely, reducing all symptoms! This is because the brain is the head of all Yang meridians, its nature is warm, and it can circulate freely. Concurrently administering Huoluo Liuqi Yin (Collateral-Unblocking Qi-Circulating Decoction) and Jiawei Ermiao Tang (Modified Two Marvels Decoction) to promote blood and Qi circulation and unblock meridians prevents toxin condensation. Externally, Bian puncture is used to let evil blood flow out, killing the toxic pathogen; beef slices are applied to draw out accumulated toxin. Within a few days, recovery occurs. Generally, when black blood flows out, Yin Qi escapes outward, and Yang Qi descends following Yin Qi. The two interact and balance each other, ensuring peace in the upper and lower parts. Thus, it became a standard method, with many cured. Not daring to keep it private, it was recorded in books and made public. The verified formulas are detailed below.

Horse Milk Method: Treats Qing Tui Ya Gan.
Use green or white horse milk. Squeeze and drink immediately morning, noon, and evening. Very effective. If green or white horses are unavailable, mixed-color horses are also acceptable.

Horse Brain Method: Treats Qing Tui Ya Gan.
Take one horse brain. Use a bamboo knife to remove fascia and membranes, place it in a bowl. Stir the horse brain evenly first, then mix with boiling yellow wine and ingest. One jin or half a jin is acceptable. If it cannot be consumed at once, divide into two doses for ingestion.

Huoluo Liuqi Yin (Also known as Hezhong Jiji Tang / Harmonizing Middle and Completing Mutual Decoction)
Cangzhu (Rhizoma Atractylodis Chinensis), Mugua (Fructus Chaenomelis), Qianghuo (Rhizoma et Radix Notopterygii), Fuzi (Radix Aconiti Lateralis Preparata, raw), Shanzha Rou (Sarcocarpus Crataegi), Duhuo (Radix Angelicae Pubescentis), Huainiuxi (Radix Achyranthis Bidentatae), Mahuang (Herba Ephedrae) [each 2 qian], Huangbai (Cortex Phellodendri), Wuyao (Radix Linderae), Ganjiang (Rhizoma Zingiberis Recens), Binglang (Semen Arecae), Zhike (Fructus Aurantii Immaturum, stir-fried with bran) [each 1.5 qian], Gancao (Radix Glycyrrhizae) (0.8 qian)
49 Black Beans, 3 slices of Fresh Ginger. Add four cups of water, decoct until one cup remains, take the liquid. Re-decoct the dregs with three cups of water until eight-tenths remain.
If gangrenous gums are severe, reduce/remove Ganjiang and Fuzi, add Huhuanglian (Rhizoma Coptidis) 2 qian, Longdancao (Herba Gentianae) 2 qian. If gangrenous gums are mild but leg pain is severe, add Rougui (Cortex Cinnamomi) 2 qian. If chills and fever have subsided, reduce/remove Qianghuo and Mahuang, add Weilingxian (Herba Siegesbeckiae) 2 qian, Wujia Pi (Cortex Acanthopanacis Senticosi) 2 qian.

[Formula Song] Huoluo Liuqi dispels wind strongly, good for initial treatment of Qing Tui Ya Gan; removes dampness, clears Stomach, unblocks meridians, do not rigidly adhere to the formula for modifications. Cangzhu, Mugua, Qianghuo, Fuzi; Shanzha, Duhuo, Niuxi, Huangbai, Mahuang; Wuyao, Ganjiang, Binglang, Zhike, Gancao; guided by Black Beans and Fresh Ginger.

Jiawei Ermiao Tang (Modified Two Marvels Decoction)
Huangbai (Cortex Phellodendri, raw), Cangzhu (Rhizoma Atractylodis Chinensis, soaked in rice wash water and stir-fried), Niuxi (Radix Achyranthis Bidentatae) [each 3 qian], Binglang (Semen Arecae), Zexie (Rhizoma Alismatis), Mugua (Fructus Chaenomelis), Wuyao (Radix Linderae) [each 2 qian], Danggui Wei (Radix Angelicae Sinensis caudex) (1.5 qian)
49 Black Beans, 3 slices of Fresh Ginger. Add three cups of water, decoct until one cup remains; re-decoct dregs with two and a half cups of water until eight-tenths remain.

[Formula Song] Modified Two Marvels helps when walking is difficult, clears swelling of gums in Qing Tui Ya Gan; Huangbai, Cangzhu, Niuxi, Danggui, Binglang, Zexie; Mugua, Wuyao, Beans, Ginger decocted.

Bian Puncture Bloodletting Method
This method uses a triangular flat needle, shaped like a cone. Aim at the blue-black areas of the leg, regardless of acupoints. Based on the size of the black area, prick one fen deep. Ten or twenty pricks are acceptable. Ensure black blood flows out. Externally, slice beef and apply it to the puncture sites and black areas. Check the next day; if the black area has slightly receded, continue pricking and applying. If beef is unavailable, prick the topmost point and use cupping therapy.

Niu Huang Qing Dai San (Ox Gallstone and Indigo Naturalis Powder for Gargling/Smearing)
Niu Huang (Calculus Bovis), Qing Dai (Indigo Naturalis) [each 0.5 qian], Pengsha (Borax) (2 qian), Zhusha (Cinnabaris), Renzhong Bai (Urinae Humanis Depuratum), Longgu (Os Mastodi et SCapulae Bovis) [each 1 qian], Bingpian (Borneolum Syntheticum) (0.3 qian)
Grind all into fine powder. First rinse the mouth thoroughly with Licorice Decoction, then apply this medicine.

[Formula Song] Niu Huang, Qing Dai, Pengsha; add Bingpian, Zhusha, Renzhong Bai. Grind Longgu together into fine powder; smear this medicine on swollen and rotten gangrenous gums.
One prescription uses boiled horse meat broth for washing.
One prescription uses sliced sheep liver applied to the black area.
One prescription uses crushed mustard seeds mixed with flour, blended with strong liquor, and applied to the black swollen area.