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Changli stated that "soft foot disease" is commonly seen in the Jiangnan region but rarely found in the northwest. This is because the eastern regions are near the sea and water bodies, areas rich in fish and salt. The local people consume a lot of fish and prefer salty food, which can cause heat to accumulate internally. In the south, the terrain is low-lying, the soil and water qi are weak, and fog and dew gather there. The locals favor sour foods, and when ill, they often suffer from limb contracture and bi-syndrome (painful obstruction). This condition arises from the combination of dampness and heat. Dampness, resembling water, tends to flow downward, and heat follows it, pouring into the shins and feet, causing redness, swelling, and pain, thereby hindering walking. In severe cases, the pathogenic factor may counter-flow upward, causing vomiting, nausea, loss of appetite, and alternating chills and fever, resembling an external contraction. It is vulgarly called "Hong Kong Foot Cold Damage," which is absurd.

Cold damage affects the meridians, traveling from the feet to the head; thus, it presents with headache and aversion to cold, hence named "Cold Damage." Dampness is contracted from below, damaging the skin, flesh, sinews, and bones, resulting in redness, swelling, pain, and heaviness, forming "Hong Kong Foot." The two are distinct, like wind and horses meeting cattle—they have nothing in common. However, some cases arise from internal factors, caused by excessive alcohol consumption and ingestion of dairy products like milk and cheese. Others result from external invasion by wind, rain, fog, and dew. Some occur neither from within nor without but are due to the qi stagnation of obese and robust individuals. These may involve downward pouring of damp-phlegm or downward flowing of yin-fire. The situations are varied, but treatment should primarily focus on dispelling dampness and clearing heat, followed by nourishing blood and cooling blood, and then relaxing sinews and removing dryness. If one does not distinguish appropriate treatments, differentiate living environments, observe the patient's strength or weakness, and regulate their qi and blood, but instead indiscriminately administer Er Miao San (Two Marvels Powder), it is unlikely to fulfill the expectations of the formula. So, what should be done?

Cangzhu Chushi Tang (Atractylodes Decoction for Dispelling Dampness):
Shancao Cangzhu (Mao Mountain Atractylodis Rhizoma, 1 qian, processed with rice wash water) Huangbai (Phellodendri Cortex, 0.7 qian, stir-fried with wine) Shengdi (Rehmanniae Radix, 1 qian) Xuan Mugua (Chaenomelis Fructus, 1 qian) Yiyiren (Coicis Semen, 2 qian) Niuxi (Achyranthis Bidentatae Radix, 1 qian) Danggui (Angelicae Sinensis Radix, 1 qian) Du Huo (Angelicae Pubescentis Radix, 0.7 qian) Guangpi (Citri Reticulatae Pericarpium, 0.8 qian) Fuling (Poria, 1 qian)
Add a handful of Jiaxin (Thomson's Rush Pith) and one slice of Shengjiang (Zingiberis Rhizoma Recens). Decoct in water. For those who drink alcohol, add Gegen (Puerariae Lobatae Radix) and Zexie (Alismatis Rhizoma), each 1 qian, or add Han Fangji (Stephaniae Tetrandrae Radix).

Baizhu Tang (Atractylopsis Macrocephala Decoction): Treats pain in the shins and feet caused by deficiency of qi and blood.
Baizhu (Atractylodis Macrocephalae Rhizoma, 1 qian, stir-fried with soil) Renshen (Ginseng Radix et Rhizoma, 1 qian) Fuling (Poria, 1 qian) Niuxi (Achyranthis Bidentatae Radix, 1 qian)
Huangbai (Phellodendri Cortex, 1 qian) Cangzhu (Atractylodis Rhizoma, 0.7 qian, processed with rice wash water) Danggui (Angelicae Sinensis Radix, 1 qian) Baishao Yao (Paeoniae Radix Alba, 1 qian, stir-fried with wine) Mugua (Chaenomelis Fructus, 1 qian) Chaihu (Bupleuri Radix, 0.5 qian) Guangpi (Citri Reticulatae Pericarpium, 1 qian)
Add two dates and one slice of ginger. Decoct in water.

Danxi treated women's shin and foot pain using:
Honghua (Carthami Flos) Niuxi (Achyranthis Bidentatae Radix) (both washed with wine) Shengdi (Rehmanniae Radix) Huangbai (Phellodendri Cortex) Cangzhu (Atractylodis Rhizoma) Nanxing (Arisaematis Rhizoma) Longdan Cao (Gentianae Radix) Chuanxiong (Ligustici Chuanxiong Rhizoma)
Decoct in water and take orally.

To treat soft feet and painful sinews, he used:
Niuxi (Achyranthis Bidentatae Radix, 2 liang) Baishao Yao (Paeoniae Radix Alba, 1.5 liang) Guiban (Testudinis Carapax et Plastrum, roasted with wine) Banban (Platycladi Cacumen, stir-fried with wine, each 1 liang) Zhimu (Anemarrhenae Rhizoma, stir-fried) Gancao (Glycyrrhizae Radix et Rhizoma, each 5 qian)
Grind into powder, make pills with wine paste.

Er Miao Wan (Two Marvels Pill):
Cangzhu (Atractylodis Rhizoma, 2 liang, soaked in rice wash water and stir-fried) Huangbai (Phellodendri Cortex, 2 liang, stir-fried with wine)
Grind into powder, make pills with Shenqu paste.

Huantui Wan (Leg-Swapping Pill): Treats conditions where the three yin meridians of the foot are attacked by wind, cold, summer-heat, and dampness, leading to contracture, bi-syndrome, flaccidity, or upward attack on the chest and back, downward pouring to the feet and knees, causing pain, fever, and difficulty walking.
Yiyiren (Coicis Semen) Nanxing (Arisaematis Rhizoma) Shi Nanye (Foliage of Euryale Salacii) Shihu (Dendrobii Caulis) Binglang (Arecae Semen) Bixie (Dioscoreae Hypoglaucae Rhizoma) (mixed with wine) Niuxi (Achyranthis Bidentatae Radix) (soaked in wine) Qiang Huo (Notopterygii Rhizoma et Radix) Fangfeng (Saposhnikoviae Radix) Mugua (Chaenomelis Fructus) (each 4 liang)
Huangqi (Astragali Radix) (honey-roasted) Danggui (Angelicae Sinensis Radix) (mixed with wine) Ming Tianma (Gastrodiae Rhizoma) Xuduan (Dipsaci Radix) (stir-fried with wine, each 1 liang)
Grind all above into powder, make pills with wine paste, size of tung seeds. Take 50 pills per dose, swallowed with salt water.