香港脚风寒湿热病，往来寒热状伤寒，腿脚痛肿热为火，不肿不热是寒干。
【注】香港脚乃内有湿热，外感风寒，相合为病，故往来寒热，状类伤寒。两脚腿痛肿
热如火者，是火盛也，不肿不热而痛者，是寒盛也，名曰干香港脚。
香港脚脉急少腹顽，不三五日入心间，呕吐喘满目额黑，恍惚谵妄命难全。
【注】香港脚脉急，少腹顽木，不知痛痒，不过三五日内，其邪必入心间。若入心间，呕
吐喘满，是为香港脚冲心之证。目额皆黑，恍惚谵妄，则是水来克火之征，故曰命难全也。
攒风散 羌活导滞汤 胜湿饼子 五积散 独活寄生汤
香港脚表解攒风散，麻桂杏草萆乌良，里解导滞羌独活，防己当归枳大黄，湿盛重肿
胜湿饼，二丑荞面遂成方，寒湿五积加附子，寒虚独活寄生汤。
【注】初病香港脚，表实无汗，用攒风散汗之，即麻黄、桂枝、杏仁、甘草、萆 、炮
川乌也，里实热盛，二便不利，用羌活导滞汤下之，即羌活，独活、防己、当归、枳实、
大黄也。湿盛重肿，用胜湿饼子，即黑丑、白丑头末，甘遂末，各五钱，荞麦面一两五钱，
水和作饼，三钱，煮熟，空心茶清服逐之。寒湿者，用五积散加附子治之，方在伤寒门。寒
虚者，用独活寄生汤补之，方在痹门。
当归拈痛汤
当归拈痛虚湿热，茵陈四苓与羌防，人参当归升芩草，苦参知母葛根苍。
【注】湿热香港脚而形气虚者，宜用当归拈痛汤，即茵陈，白术、茯苓、猪苓、泽泻、羌
活、防己、人参、当归，升麻，黄芩、甘草、苦参、知母、葛根、苍术也。
加味苍柏散
加味苍柏实湿热，二活二术生地黄，知柏芍归牛膝草，木通防己木瓜榔。
【注】湿热香港脚而形质实者，宜用加味苍柏散，即羌活、独活、苍术、白术、生地黄、
知母、黄柏、赤芍、当归、牛膝、甘草、木通、防己、木瓜、槟榔也。
大防风汤
两膝肿大而疼痛，髀胫枯细鹤膝风，大防风附羌牛杜，十全大补减茯苓。
【注】两膝肿大疼痛，膝上至髀、膝下胫足枯细，但存皮骨，两膝状若鹤膝，故名鹤
膝风也。宜大防风汤，即防风、附子、羌活、牛膝、杜仲、人参、白术、炙草、当归、川
芎、白芍、熟地、炙 、肉桂也。此病若得之于痢疾病后者，名曰痢风，亦用此方。
Hongjiao (a disease characterized mainly by swelling and pain in the legs and feet) is caused by wind-cold-damp-heat pathogens. Its symptoms manifest as alternating chills and fever, resembling Shanghan (Cold Damage). If the legs and feet are painful, swollen, and hot, it is due to Fire (excess heat); if they are not swollen or hot but painful, it is due to Cold (cold-dampness).
[Annotation] Hongjiao arises from internal damp-heat combined with external contraction of wind-cold, leading to alternating chills and fever, presenting similarly to Shanghan. If both legs and feet are painful, swollen, and burning hot like fire, this indicates an excess of Fire; if there is no swelling or heat but only pain, this indicates an excess of Cold. This condition is named "Dry Hongjiao."
In Hongjiao, the pulse is rapid/tight, and the lower abdomen feels numb and stiff, with loss of sensation to pain and itch. Within three to five days, if the pathogen invades the Heart region, symptoms such as vomiting, panting, chest fullness, blackening of the eyes and forehead, mental confusion, and delirium may occur. At this stage, the condition is critical and life-threatening.
[Annotation] In Hongjiao, a rapid/tight pulse accompanied by numbness and stiffness in the lower abdomen, with insensitivity to pain and itch, suggests that within three to five days, the pathogen will inevitably invade the Heart. If it invades the Heart, resulting in vomiting, panting, and chest fullness, this is the syndrome of Hongjiao rushing to the Heart. Blackening of the eye sockets and forehead, along with mental confusion and delirium, signifies Water overcoming Fire, hence stating that life cannot be preserved.
Zan Feng San (Gathering Wind Powder), Qiang Huo Dao Zhi Tang (Notopterygium Decoction for Guiding Out Stagnation), Sheng Shi Bing Zi (Dampness-Overcoming Cake), Wu Ji San (Five Accumulations Powder), Du Huo Ji Sheng Tang (Angelica Pubescens Decoction for Nourishing Life).
If the exterior syndrome of Hongjiao has resolved, use Zan Feng San, which contains Mahuang (Ephedrae Herba), Guizhi (Cinnamomi Ramulus), Xingren (Armeniacae Semen Amarum), Gancao (Glycyrrhizae Radix et Rhizoma), Bibo (Dioscoreae Hypoglaucae Rhizoma), and Pao Chuanwu (Prepared Aconiti Lateralis Radix). If the interior syndrome has resolved and heat is excessive, use Qiang Huo Dao Zhi Tang, which contains Qianghuo (Notopterygii Rhizoma et Radix), Duhuo (Angelicae Pubescentis Radix), Fangji (Stephaniae Tetrandrae Radix), Danggui (Angelicae Sinensis Radix), Zhishi (Aurantii Fructus Immaturus), and Dahuang (Rhei Radix et Rhizoma). If dampness is excessive with severe swelling, use Sheng Shi Bing Zi, composed of Heiqiu (Semen Cassiae) and Baiqiu (Semen Cassiae) head powder, each 5 qian, Gansui (Kansui Radix) powder, and Qiaomai mian (Fagopyri Tatarici Farina) 1.5 liang. Mix with water to form cakes, take 3 qian per dose, boiled, taken on an empty stomach with tea infusion to purge dampness. For cold-dampness, treat with Wu Ji San plus Fuzi (Aconiti Lateralis Praeparata Radix), recorded in the Shanghan section. For cold-deficiency, tonify with Du Huo Ji Sheng Tang, recorded in the Bi (Obstruction) section.
Dang Gui Nian Tong Tang (Angelica Sinensis Decoction for Relieving Pain)
Dang Gui Nian Tong Tang is suitable for damp-heat Hongjiao in patients with deficient constitution. It contains Yinchen (Artemisiae Scopariae Herba), Si Ling San (Four Poria Powder: Baizhu, Fuling, Zhuling, Zexie), Qianghuo, Fangji, Renshen (Ginseng Radix), Danggui, Shengma (Cimicifugae Rhizoma), Huangqin (Scutellariae Radix), Gancao, Kushen (Sophorae Flavescentis Radix), Zhimu (Anemarrhenae Rhizoma), Gegen (Puerariae Lobatae Radix), and Cangzhu (Atractylodis Rhizoma).
[Annotation] For damp-heat Hongjiao with deficient qi and body constitution, Dang Gui Nian Tong Tang is appropriate. The formula consists of Yinchen, Baizhu (Atractylodis Macrocephalae Rhizoma), Fuling (Poria), Zhuling (Polyporus), Zexie (Alismatis Rhizoma), Qianghuo, Fangji, Renshen, Danggui, Shengma, Huangqin, Gancao, Kushen, Zhimu, Gegen, and Cangzhu.
Jia Wei Cang Bai San (Modified Cangbai Powder)
Jia Wei Cang Bai San is suitable for damp-heat Hongjiao in patients with solid/excess constitution. It contains Qianghuo, Duhuo, Cangzhu, Baizhu, Shengdihuang (Rehmanniae Radix Recens), Zhimu, Huangbai (Phellodendri Cortex), Chishao (Paeoniae Radix Rubra), Danggui, Niuxi (Achyranthis Bidentatae Radix), Gancao, Mutong (Akebiae Caulis), Fangji, Mugua (Chaenomelis Fructus), and Binglang (Arecae Semen).
[Annotation] For damp-heat Hongjiao with a solid physical constitution, Jia Wei Cang Bai San is appropriate. The formula consists of Qianghuo, Duhuo, Cangzhu, Baizhu, Shengdihuang, Zhimu, Huangbai, Chishao, Danggui, Niuxi, Gancao, Mutong, Fangji, Mugua, and Binglang.
Da Fang Feng Tang (Great Saposhnikovia Decoction)
If both knees are swollen and painful, with the thighs and calves emaciated while the knees remain large, resembling a crane's knee, it is called He Xi Feng (Crane Knee Wind). Use Da Fang Feng Tang, containing Fangfeng (Saposhnikoviae Radix), Fuzi, Qianghuo, Niuxi, Duzhong (Eucommiae Cortex), Renshen, Baizhu, Zhi Gancao (Honey-fried Glycyrrhizae Radix et Rhizoma), Danggui, Chuanxiong (Ligustici Chuanxiong Rhizoma), Baishao (Paeoniae Radix Alba), Shudihuang (Rehmanniae Radix Preparata), Zhi Huangqi (Astragali Radix), and Rougui (Cinnamomi Cortex). If this disease occurs after dysentery, it is called Li Feng (Dysentery Wind), and this formula is also used.
[Annotation] Swelling and pain in both knees, with emaciation from the thighs above the knees to the calves below, leaving only skin and bone, and knees shaped like a crane's knee, is therefore named Crane Knee Wind. Da Fang Feng Tang is appropriate, consisting of Fangfeng, Fuzi, Qianghuo, Niuxi, Duzhong, Renshen, Baizhu, Zhi Gancao, Danggui, Chuanxiong, Baishao, Shudihuang, Zhi Huangqi, and Rougui. If this disease is contracted following dysentery, it is named Li Feng, and this same formula should be used.