足三阴湿热，腿脚红肿，皮破流脂，类乎血疯，浸淫不止，痒痛非常，当用黄连膏治之。
黄连膏 治烂皮湿热。先用桐油一斤入锅，熬起白星为度，加黄蜡一两五钱
熔化，入研细炒黑大黄末一斤搅匀，入冰片二分摊贴。
又方 半枝莲捣烂敷之。
远行奔走，皆由包脚布纵而不平，或钉鞋钉或袜底得汗纵起，或鞋大小挤脚，皆
能起泡，亦有伤及良肉，溃脓 痛者。
又曰∶行远路者走十余里，将包脚布从新包扎，则不起泡。
又方 饭粘捣敷，以纸覆之，过夜平复。
又方 水调白面敷之。
人走长路紧急，被石块脚底垫肿，不能行步，痛不可忍者，名曰脚垫。（《怀德堂秘
录》）。急用旧草鞋浸尿桶内一夜，将新砖烧
红，以浸湿草鞋放砖上，随以肿脚踏上火砖，逼尿气入内即消。若不早治，恐溃烂
难愈，如走长路，脚肿疼痛，亦用此法立消。
凡久行久立脚心脚痛 单方 蚯蚓屎水和敷，一夕即愈。
桑杏汤
桑白皮（八钱） 朴硝（一两） 乳香 杏仁（各二钱）
五大碗水，先煎桑、杏至三碗，再入乳、硝封口化尽，先熏后洗，足大能小，其软如绵。
又方
明矾（一两） 威灵仙 川椒 凤仙花 玉簪花（各三钱） 皮硝（五钱）
水煎一个时辰，先熏后洗。
Damp-heat in the three Yin meridians of the foot (Liver, Spleen, Kidney) causes swelling and redness of the legs and feet, with skin breakdown and exudation of serous fluid. The condition resembles Xuefeng Chuang (Blood Wind Sores, a dermatological condition characterized by itching and oozing), spreading incessantly with severe itching and pain. It should be treated with Huanglian Gao (Coptis Ointment).
Huanglian Gao: Treats damp-heat causing skin erosion. First, boil one jin (approx. 500g) of Tung Oil (Verniciae Folii Oleum) in a pot until white bubbles appear. Add one liang and five qian (approx. 62.5g) of Beeswax (Zhuxi La) and melt it. Then, mix in one jin of finely ground, stir-fried black Rhubarb powder (Dahuang Mo). Stir evenly, add two fen of Borneol (Bingpian), and apply externally as a plaster.
Another prescription: Mash Banzhilian (Scutellaria Barbata Herb) and apply it to the affected area.
Long-distance walking or running is often caused by bandages being loose or uneven, or by sweat causing shoe nails or sock soles to wrinkle and loosen, or by shoes that are too tight or ill-fitting squeezing the feet. All these factors can cause blisters. In some cases, healthy flesh is injured, leading to suppuration, ulceration, and pain.
It is also said: For those traveling long distances, re-wrapping the foot bandages after walking more than ten li prevents blister formation.
Another prescription: Mash Fan Zhan (Sticky Rice) and apply it externally. Cover with paper; it will heal flat overnight.
Another prescription: Mix Bai Mian (Wheat Flour) with water and apply externally.
When people walk long distances urgently and have stones pressing against their soles, causing swelling that prevents walking and unbearable pain, this is called Jiao Dian (Foot Callus/Corn) (from *Huaidetang Milu*). For emergency treatment, soak old straw shoes in a urine bucket overnight. Heat a new brick until red-hot. Place the wet straw shoe on the hot brick, then step the swollen foot onto the hot brick. The heat forces the urine vapor into the tissue, reducing the swelling immediately. If not treated early, it may ulcerate and become difficult to heal. This method also instantly relieves foot swelling and pain caused by long-distance walking.
For foot pain in the sole due to prolonged walking or standing, use this single prescription: Mix Earthworm Excrement (Qiu Yin Shi) with water and apply externally; it heals in one night.
To stop Foot Sweat:
Bai Fan (Alumen) and Gan Ge (Puerariae Radix) (each five qian).
Decoct in water and wash continuously for five days; the sweat will stop naturally.
Sangxing Tang (Mulberry Leaf and Apricot Seed Decoction):
Sangbaipi (Mori Cortex) (eight qian), Poxiao (Natrii Sulfas), Ruxiang (Olibanum), Xingren (Armeniacae Semen Amarum) (each two qian).
Use five large bowls of water. First decoct Sangbaipi and Xingren until reduced to three bowls. Then add Ruxiang and Poxiao, seal the container, and allow them to dissolve completely. Fumigate first, then wash. This reduces the size of the foot and makes it soft as cotton.
Another prescription:
Mingfan (Alumen) (one liang), Weilingxian (Syneilesis Acaulis Herb), Chuanjiao (Zanthoxyli Pericarpium), Fengxianhua (Impatiens Balsamina Flower), Yuzanhua (Hemerocallis Citrina Flower) (each three qian), Pixiao (Natrii Sulfas).
Decoct in water for one shichen (two hours). Fumigate first, then wash.