足大趾渍而自脱，难治。如色变赤黑者，死，宜急截去。余指易治。初起以万病解毒丹，醋
磨浓涂；未成者，宜蒜灸，次托里消毒，用引经药，或败毒散加银花、牛膝、白芷、大黄或活命
饮。
因肾虚风湿所搏，气血壅滞，毒在肤腠，不得宣通，脚上生疮。若风毒不散，迁延日久，黄
水淋漓，气血亏伤，难治。
主方 （风湿肿溃） 漏芦 五加皮 槐皮 白蔹 甘草（各七钱半） 蒺藜子（二两）
水煎，无风处淋洗。
敷脚疮 毡灰 红枣（烧灰） 竹蛀屑 黄丹 枯矾 韶粉 上各等分，研匀掺之。
指甲内溃烂。因于湿热，或剪伤，或履窄。勿凉药敷。
敷方 绿矾（铁器内炭火封 溶化，令汁干，取赤者研，五钱） 芦荟（一钱五分） 麝香
（三分）
上研细和匀，制一绢袋盛药，套指上，线扎定，日掺自愈。
脚指四边肿烂，以前矾末一钱，入乳香末三分，敷愈。
又方 牡蛎头生研极细，每服二钱，靛花研酒调下，仍敷患处。
又方 乌梅或白梅，取肉蒸烂裹，或烧灰调敷。
指头肿烂，爪甲结脓，用乌梅核中仁为末，米醋调膏，另以朴硝泡汤洗，渍指于前膏内，或
以猪油调蚯蚓粪涂。
足面生疽，属足厥阴、阳明二经之会。由湿热乘虚下注。活命饮加木瓜、肉桂、牛膝。先蒜
灸，次托里，再用十全之类。用羊粪瓦上炙干，烟尽罗末，麻油调敷。痒加轻粉，痛加麝少许，
敷。外以山茶叶，或冬青叶裹之，绢条才定。
足大趾溃烂并自行脱落，难以治疗。如果颜色变为赤黑色，预后不良（主死），应当紧急截除患肢。其余脚趾的病变较易治疗。初起时可用万病解毒丹，用醋磨浓后涂抹；尚未化脓者，适宜用大蒜灸法，随后使用托里消毒散，配合引经药，或者使用败毒散加入金银花、牛膝、白芷、大黄，或者使用仙方活命饮。
这是由于肾虚导致风湿之邪搏结，气血壅滞，毒邪停留在皮肤腠理之间，无法宣通发散，从而在脚上生疮。如果风毒不能消散，拖延日久，黄水淋漓不止，导致气血亏虚损伤，则难以治疗。
主治方剂（针对风湿引起的肿胀溃烂）：漏芦、五加皮、槐皮、白蔹、甘草（各七钱半），蒺藜子（二两）。
用水煎煮，在无风处淋洗患处。
敷治脚疮方：毡灰、红枣（烧成灰）、竹蛀屑、黄丹、枯矾、韶粉。以上各等分，研匀后撒敷患处。
指甲内溃烂。多因湿热引起，或因修剪指甲受伤，或鞋子过窄挤压所致。切勿使用寒凉药物外敷。
敷治方：绿矾（在铁器内用炭火密封熔化，待汁液干涸，取红色部分研磨，五钱），芦荟（一钱五分），麝香（三分）。
以上药材研细混合均匀，制作一个绢袋盛装药物，套在手指上，用线扎紧，每日掺药即可自愈。
脚趾四周肿胀溃烂，以前述矾末一钱，加入乳香末三分，敷贴治愈。
又一方：牡蛎头生研极细，每次服用二钱，用靛花研碎后用酒调服，同时仍在外敷患处。
又一方：乌梅或白梅，取果肉蒸烂包裹，或烧成灰后调敷。
指头肿胀溃烂，爪甲下结脓，用乌梅核中的仁研为粉末，用米醋调成膏状，另外用朴硝泡汤清洗，将手指浸泡在前述膏药中，或者用猪油调和蚯蚓粪涂抹。
足背生疽，属于足厥阴肝经和足阳明胃经交会之处。由湿热乘虚下注所致。使用仙方活命饮加入木瓜、肉桂、牛膝。先用大蒜灸，随后托里透脓，再使用十全大补汤之类。用羊粪在瓦上炙烤至干，烟尽后筛成粉末，用麻油调敷。发痒加轻粉，疼痛加少许麝香，敷贴。外用山茶叶，或冬青叶包裹固定，用绢条扎紧。
The big toe of the foot ulcerates and falls off spontaneously, which is difficult to treat. If the color changes to red-black, it indicates a fatal prognosis, and urgent amputation is advisable. Lesions on other toes are easier to treat. At the initial stage, apply Wanshen Jiedu Dan (Ten-Thousand-Disease Detoxifying Pill) ground thickly with vinegar; if no abscess has formed, garlic moxibustion is suitable, followed by Tuoli Xiaodu San (Supporting Interior and Disinfecting Powder), combined with channel-guiding herbs, or use Baidu San (Defeating Toxin Powder) added with Yinhuajia (Jinyinhua/Golden Flower), Niuxijia (Niuxi/Red Sage Root), Baizhijia (Baizhi/Saposhnikovia Root), Dahuangjia (Dahuang/Rhubarb Root), or Xianfang Huoming Yin (Immortal Life Decoction).
This condition arises from Kidney deficiency allowing Wind-Dampness to contend, causing Qi and Blood stagnation, with toxic pathogens lodged in the skin and interstices, unable to be vented and unblocked, resulting in sores on the feet. If Wind-Toxin does not dissipate and lingers for a long time, with profuse yellow discharge, leading to Qi and Blood depletion and injury, it becomes difficult to treat.
Main Prescription (for Wind-Damp swelling and ulceration): Loulujia (Radix Euphorbiae Humifusae), Wujiajia (Cortex Acanthopanacis), Huaipijia (Cortex Sophorae Flavescentis), Bailianjia (Rhizoma Belamcandae), Gancaojia (Radix Glycyrrhizae Uralensis) (each 7.5 qian), Jilijia (Fructus Tribuli) (2 liang).
Decoct in water and wash the affected area in a windless place.
Application for Foot Sores: Zhanhui (Felt Ash), Hongzao (Chinese Date, burnt to ash), Zhuzhushe (Bamboo Borings), Huangdan (Lead Monoxide), Kufan (Alumen), Shaofen (Kaolin). Mix equal parts of each, grind uniformly, and sprinkle on the lesion.
Ulceration inside the fingernail. Caused by Damp-Heat, or injury from trimming, or wearing narrow shoes. Do not apply cold-natured medicines externally.
Application Formula: Lüfan (Green Vitriol, sealed in an iron vessel over charcoal fire until melted and dried, take the red part and grind, 5 qian), Luhuajia (Aloe), Shexiangjia (Musk).
Grind the above into fine powder and mix uniformly. Prepare a silk bag to hold the medicine, fit it over the finger, tie securely with thread, and apply daily for self-healing.
Swelling and ulceration on all four sides of the toes: Apply 1 qian of alum powder mixed with 3 fen of Incense powder (Ruxiangjia) topically for cure.
Another Formula: Crush fresh Oumujia (Oyster Shell) very finely. Take 2 qian orally, mixed with Indigo flower powder and wine, while continuing topical application to the affected area.
Another Formula: Use Wumeijia (Mume Fruit) or Baimiejia (White Plum), steam the flesh until soft and wrap, or burn to ash and mix for topical application.
Swelling and ulceration of the fingertip with pus formation under the nail: Grind the kernel inside the Wumei pit into powder, mix with rice vinegar to form a paste. Alternatively, wash with a solution of Xiaoshaoshi (Mirabilite), soak the finger in the aforementioned paste, or apply earthworm feces mixed with pork fat.
Carbuncle on the dorsum of the foot belongs to the intersection of the Foot-Jueyin Liver Channel and Foot-Yangming Stomach Channel. It results from Damp-Heat sinking downward due to deficiency. Use Xianfang Huoming Yin (Immortal Life Decoction) added with Mugujia (Papaya Fruit), Rouguijia (Cinnamon Bark), and Niuxijia (Red Sage Root). First apply garlic moxibustion, then support the interior, followed by formulas like Shiquan Dabu Tang (Complete Great Tonifying Decoction). Roast sheep dung on a tile until dry, when smoke ceases, sieve into powder, and mix with sesame oil for topical application. Add Qingfenjia (Calomel) if itching, or a small amount of Shexiangjia (Musk) if painful, and apply. Externally wrap with Shanchaye (Camellia Leaf) or Dongqingye (Ilex Aquifolium Leaf), securing with a silk strip.