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[Appendix: Vine-like Entanglement (Gua Teng Chan)]
Damp-toxin Liuzhu (Flowing Abscess) arises on the lower leg and shin. The ulcer's apex resembles a cow's eye, surrounded by diffuse swelling. A purple hue indicates mild severity, while a black hue indicates severe severity; upon ulceration, pus exudate soaks the skin. This condition is caused by the condensation of cold-dampness, summerheat, and heat pathogens in the Couli (interstitial spaces between skin and muscle).

[Commentary] This syndrome occurs in the thigh and calf regions, with a migratory nature, sometimes manifesting in one or two locations. The ulcer apex resembles a cow's eye, with diffuse root swelling. Mild cases present with a purple color, severe cases with a black color. Upon ulceration, pus exudate causes healthy tissue to rot, leading to chronic non-healing wounds over time. It results from pathogenic factors such as violent wind and rain, cold-dampness, summerheat, and fire invading the Couli, causing disease in the muscles. At the initial stage, immediately administer Fangfeng Tongsheng San (Windproof Unimpeded Powder), added with Mugua (Chaenomeles Fruit), Niuxi (Achyranthes Root), Fangji (Stephania Root), and Cangzhu (Atractylodes Rhizome) to eliminate the pathogen. If the lower legs become hot in the evening, Danggui Niantong Tang (Angelica Joint-Pain Decoction) added with Niuxi (Achyranthes Root) is suitable. For external treatment, initially apply Sanmiao San (Three Marvels Powder); once swelling and pain completely subside, switch to applying Qingfen San (Calomel Powder) to promote healing, which yields effective results. If the condition wraps around the shin, it is named "Vine-like Entanglement" (Gua Teng Chan), presenting with several nodules. Over time, swelling and pain persist, and tissue continues to rot. This also belongs to damp-heat pouring downward, and the treatment method is the same as above.

Qingfen San (Calomel Powder)
Ingredients: Qingfen (Calomel, 1.5 qian), Huangdan (Lead Tetroxide), Huangbai (Phellodendron Bark), Mituosen (Litharge), Gaomo Cha (High-grade Tea Leaves), Ruxiang (Frankincense) (each 3 qian), Shexiang (Musk, 0.5 fen).
Preparation: Grind all ingredients into powder together. First, wash the affected area with decoction made from scallions, then apply this medicine.
[Prescription Verse] Calomel, Lead Tetroxide, Phellodendron, and Litharge, Mixed with tea leaves, frankincense, and musk ground fine; For damp-toxin flowing abscesses, it resolves decay, removes dampness, and stops pain.
Fangfeng Tongsheng San (See section on Scalp Alopecia Areata)
Danggui Niantong Tang (See section on Migratory Leg Pain in the Thigh Region)
Sanmiao San (See section on Umbilical Carbuncle in the Abdomen)

Shenqi Youfeng (Kidney-Energy Wandering Wind) arises in the calf muscle. It presents with redness and swelling like cloud patches, accompanied by burning pain. The etiology involves Kidney Fire accumulating internally, Qi stagnation in the Bladder, and external invasion of Wind pathogens.

[Commentary] This syndrome often occurs in individuals with Kidney Deficiency. The calf exhibits redness and swelling resembling cloud patches, migrating without fixed location, with pain feeling like burning fire. It is formed by internal accumulation of Kidney Fire, external invasion of Wind pathogens, and Qi stagnation in the Bladder. Initially administer Zisu Liuqi Yin (Perilla Qi-Circulating Decoction), followed by Binglang Wan (Areca Nut Pill). Externally, grind tofu and mix with Huangbai (Phellodendron Bark) powder, then apply as a poultice; this is highly effective.

Zisu Liuqi Yin (Perilla Qi-Circulating Decoction)
Ingredients: Zisu (Perilla Leaf), Huangbai (Phellodendron Bark), Mugua (Chaenomeles Fruit), Binglang (Areca Seed), Xiangfu (Cyperus Rhizome), Chenpi (Citrus Peel), Chuanxiong (Ligusticum Rhizome), Nongpo (Magnolia Bark, stir-fried with ginger), Baizhi (Angelica Dahurica Root), Cangzhu (Atractylodes Rhizome, soaked in rice water, stir-fried), Wuyao (Litsea Root), Jingjie (Schizonepeta Spike), Fangfeng (Saposhnikovia Root), Gancao (Licorice Root), Duhuo (Angelica Pubescens Root), Zhike (Bitter Orange, bran-stir-fried).
Usage: Equal parts of the above herbs, add three slices of ginger and one jujube, decoct in water and take orally.
[Prescription Verse] Perilla, Qi-circulating agents, Phellodendron, Chaenomeles, Areca, Cyperus, Citrus, Ligusticum, Magnolia, Angelica, Atractylodes, Litsea, Schizonepeta, Saposhnikovia, Licorice, Angelica Pubescens, Bitter Orange; For Kidney-Energy Wandering Wind, taking this is most auspicious.
Binglang Wan (Areca Nut Pill)
Ingredients: Binglang (Areca Seed), Zhike (Bitter Orange, bran-stir-fried, each 2 liang), Mugua (Chaenomeles Fruit, 1.5 liang), Muxiang (Vladimiria Root, 1 liang), Dahuang (Rhubarb Root, 4 liang).
Preparation: Grind finely into powder, bind with refined honey to form pills the size of Chinese quince seeds. Take 30 pills per dose, swallowed with warm boiled water on an empty stomach; swallowing with yellow wine is also acceptable.
[Prescription Verse] Areca nut, bitter orange, chaenomeles ground fine, Vladimiria root and rhubarb bound with honey pill; For kidney-energy wandering wind with redness, swelling, and pain, taken on an empty stomach with water, recovery comes naturally.