臭田螺疮最缠绵，脚丫搔痒起白斑，搓破皮烂腥水臭，治宜清热渗湿痊。
【注】此证由胃经湿热下注而生。脚丫破烂，其患甚小，其痒搓之不能解，必搓至皮
烂，津腥臭水觉疼时，其痒方止，次日仍痒，经年不愈，极其缠绵。法宜甘草薏苡仁煎汤
洗之，嚼细茶叶涂之，干则黄连膏润之；破烂甚者，宜用鹅掌皮， 存性，研末，香油
调敷，甚效。
\r臭田螺图\p04-34a224.bmp\r
黄连膏（见鼻部鼻疮）
牛程蹇因奔走急，脚热着水寒风袭，气滞血凝起硬埂，法宜鸽粪滚汤渍。
【注】此证生于足跟，及足掌皮内，顽硬肿起，高埂色黄，疼痛不能行履。由脚热着
冷水，或遇寒风袭于血脉，令气滞血凝而成，法宜用盆一个，内安新砖，砖上安鸽粪，粪上合罩篱，以脚踏罩篱上；次
以滚水从旁冲入，蒸之、浸渍之，冷则易之。或用新砖烧红，韭菜汁泼之，将病足踏于其上烫之。早
治或有消者，久则破裂，脓水津流，每日米泔水净洗，搽牛角散，四围顽皮浮起剪之，换
搽生肌玉红膏、月白珍珠散，生肌敛口自愈。
\r牛程蹇图\p04-34a225.bmp\r
牛角散
松香 轻粉 水龙骨（即旧船底油锻石） 牛角尖（烧灰）
共为末，牛骨髓调搽。
【方歌】牛角散治牛程蹇，久破脓水流不痊，松香轻粉水龙骨，牛角烧灰须用尖。
生肌玉红膏 月白珍珠散（俱见溃疡门）
Chou Tianluo Chuang (Stinky River Snail Ulcer) is the most lingering and difficult to cure. Itching occurs in the interdigital spaces with white patches appearing. When rubbed until the skin breaks, foul-smelling fluid oozes out. Treatment should focus on clearing heat and leaching out dampness for recovery.
[Note] This condition arises from damp-heat pouring downward from the Stomach Meridian. Although the lesion in the interdigital space appears minor, the itching is severe and cannot be relieved by rubbing. It only stops when the skin is rubbed until broken, exuding fluid and foul-smelling liquid accompanied by pain. The itching returns the next day, persisting for years without healing, making it extremely lingering. The method suggests washing with a decoction of Gancao (Licorice Root) and Yiyiren (Coix Seed). Chewed tea leaves should be applied topically; if dry, apply Huanglian Gao (Coptis Ointment) to moisturize. For severe ulceration, E Zhang Pi (Goose Palm Skin), processed to retain its medicinal nature (cun xing), should be ground into powder and mixed with sesame oil for application, which is highly effective.
Niu Cheng Jian (Ox's Callus) results from hurried walking, where hot feet contact cold water and are subsequently attacked by cold wind, leading to qi stagnation and blood coagulation that form hard ridges. The treatment method involves soaking in boiling water with pigeon droppings.
[Note] This condition occurs under the skin of the heel and sole, presenting as stubborn, hard swelling with yellowish raised ridges, causing pain that prevents walking. It is caused by hot feet contacting cold water or cold wind attacking the blood vessels, resulting in qi stagnation and blood coagulation. The method involves using a basin containing a new brick, on which pigeon droppings are placed. A bamboo cover (zhao li) is placed over the droppings, and the patient steps on the cover. Boiling water is poured in from the side for steaming and soaking; replace when cool. Alternatively, heat a new brick until red-hot, splash it with Chinese chive juice, and step on it for thermal therapy. Early treatment may lead to resolution; if neglected, it will rupture, with continuous pus discharge. Wash daily with rice wash water, apply Niu Jiao San (Horn Powder), trim the raised dead skin around the periphery, then switch to applying Sheng Ji Yu Hong Gao (Flesh-Regenerating Jade Red Ointment) and Yue Bai Zhen Zhu San (Moon-White Pearl Powder). Muscle regeneration and wound closure will occur naturally.
Niu Jiao San (Horn Powder)
Xiang Ru (Borneol/Resin), Qing Fen (Calomel), Shui Long Gu (Old Ship Bottom Pitch), Niu Jiao Jian (Horn Tip, burned to ash).
Grind all into powder and mix with Niu Su Sui (Ox Marrow) for topical application.
[Prescription Song] Niu Jiao San treats Niu Cheng Jian, where chronic rupture and pus flow resist healing; Xiang Ru, Qing Fen, and Shui Long Gu are used, along with horn tip ash.
Sheng Ji Yu Hong Gao (Flesh-Regenerating Jade Red Ointment) and Yue Bai Zhen Zhu San (Moon-White Pearl Powder) (Both see Section on Ulcers)