【方歌】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，〔火段〕存性，研末，香油调敷，甚效。
方剂：黄连膏（见鼻部鼻疮）
【方歌】牛程〔足蹇〕因奔走急，脚热着水寒风袭，气滞血凝起
硬埂，法宜鸽粪滚汤溃。
【注】此证生于足跟，及足掌皮内，顽硬肿起，高块色黄，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
、浸溃之，冷则易之。或用新砖绕红，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。
方剂：牛角散
组成：松香 轻粉
水龙骨（即旧船底油石灰） 牛角尖（烧灰）
共为末，牛骨髓调搽。
【方歌】牛角散治牛程〔足蹇〕，久破脓水流不痊，松香轻粉水
龙骨，牛角烧灰须用尖。
又方：生肌玉红膏、月白珍珠散（俱见溃疡门）
[Prescription Verse] The "Stinky River Snail" sore (Chou Tianluo Chuang) is most lingering and difficult to cure; itching in the interdigital spaces accompanied by white patches occurs. After rubbing until the skin breaks and foul-smelling fluid oozes out, treatment should employ clearing heat and draining dampness for recovery.
[Annotation] This condition arises from damp-heat pouring downward from the Stomach Meridian. Although the lesions in the interdigital spaces appear minor, the itching is severe and cannot be relieved by rubbing; it only ceases when the skin is rubbed until broken, causing stinging pain from the exudation of foul-smelling fluids. The itching recurs the next day, persisting for years without healing, making it extremely lingering. The method involves washing with a decoction of Licorice Root (Gancao) and Coix Seed (Yiyiren); applying chewed tea leaves to the area; and moistening with Coptis Ointment (Huanglian Gao) if dry. For severe ulcerations, Goose Palm Skin (E Zhang Pi), calcined over fire until carbonized but retaining its nature, is ground into powder and mixed with sesame oil for topical application, which is highly effective.
Formula: Coptis Ointment (Huanglian Gao) (See Nasal Ulcer section).
[Prescription Verse] Niu Cheng Cun (Niu Cheng Kuan/Foot Deformity due to Walking) results from hurried walking; when hot feet contact cold water or are attacked by cold wind, qi stagnation and blood coagulation form hard ridges. The method involves using pigeon droppings with boiling water to soften and disperse the lesion.
[Annotation] This condition arises within the skin of the heel and sole, presenting as stubborn, hard swelling with high, yellowish nodules, causing pain that prevents walking. It is caused by hot feet contacting cold water or cold wind attacking the blood vessels, leading to qi stagnation and blood coagulation. The method involves placing a new brick in a basin, putting pigeon droppings on the brick, and covering it with a bamboo sieve. The patient steps on the sieve, and boiling water is poured in from the side to steam and soak the foot, dispersing the hardness; replace the water when it cools. Alternatively, heat a new brick red-hot, splash it with leek juice, and step on it for thermal therapy. Early treatment may resolve the lump; if prolonged, it will rupture with continuous pus discharge. Wash daily with rice wash water (Migan Shui), apply Horn Powder (Niujiao San), trim the raised dead skin around the periphery, then switch to applying Muscle-Nourishing Jade Red Ointment (Shengji Yuhong Gao) and Moon-White Pearl Powder (Yuebai Zhenzhu San) to promote tissue regeneration and wound closure, leading to spontaneous healing.
Formula: Horn Powder (Niujiao San)
Composition: Pine Resin (Songxiang), Calomel (Qingfen), Water Dragon Bone (Shuili Long, i.e., oil-paste from old ship bottoms), Horn Tip (Niujiao Jian, calcined to ash).
Grind all into powder, mix with Ox Marrow (Niu Suisui) for topical application.
[Prescription Verse] Horn Powder (Niujiao San) treats Niu Cheng Cun (Niu Cheng Kuan/Foot Deformity due to Walking), specifically for chronic non-healing cases with flowing pus; use Pine Resin (Songxiang), Calomel (Qingfen), Water Dragon Bone (Shuili Long), and calcined Horn Tip (Niujiao Jiaohui).
Another Prescription: Muscle-Nourishing Jade Red Ointment (Shengji Yuhong Gao) and Moon-White Pearl Powder (Yuebai Zhenzhu San) (Both found in the Ulcer Section).