【方歌】鳝漏生在腿肚间，孔如钻眼津水绵，颇类湿疮湿热发，
艾汤薰洗觉痒痊。
【注】此证由湿热而成。初起颇类湿疮，生于腿肚，痒痛相兼
，破津黄水、绵绵不已，其孔深如钻眼，复受寒气侵入
疮孔，以致口寒肌冷。法宜艾叶、老葱熬汤，每日先薰
后洗。疮口发热觉痒时，即贴黄蜡膏，收敛而愈。
方剂：黄腊膏（见〔月廉〕疮）
【方歌】四弯风生腿脚弯，每月一发最缠绵，形如风癣风邪袭，
搔破成疮痒难堪。
【注】此证生在两腿弯、脚弯，每月一发，形如风癣，属风邪
袭入腠理而成。其疮无度，搔破津水，形如湿癣。法宜
大麦一升熬汤，先薰后洗；次搽三妙散，渗湿杀虫，其
疮即止，缓缓取效。
方剂：三妙散（见腹部脐痈）
【方歌】风疽生胫曲凹中，痒搔皮损津汁脓，风邪留于血脉内，
烦热昏冒肌肿疼。
【注】此证生胫骨及曲凹之处，痒搔皮损，津黄汁，极其粘浓
。由风邪留于血脉相搏而成。因其根深，故有疽名。甚
则身体烦热，昏冒，而肌肉透红，更增肿疼。宜服防风
汤，外抹青竹大豆油，即效。
方剂：防风汤
组成：防风 附子（制）
麻黄（蜜炙） 白芷
木通 柴胡
当归（焙） 桔梗
甘草（炙） 羌活（各五分）
共为粗末，水一钟半，煎八分，澄去滓，食后服，
临睡再用一服。如欲出汗，俟空心，头煎落滓，并一服
之；后食稀粥、生姜，食毕被覆卧取汗，避风。
【方歌】防风汤疗风熬搏，留于血脉津汁破，附子麻黄芷木通，
柴胡归桔甘羌活。
又方：青竹大豆油
组成：青竹筒截三尺长，径一寸半，筒内装黑豆一升，以谷糠
、马粪二物烧火，当竹筒中炙之，以磁碗两头接取油汁
。先以清水泔水和盐热洗患处，拭干，即涂豆油，不过
三度极效。
【方歌】青竹筒截三尺长，径要寸半黑豆装，谷糠马粪烧炙筒，
风疽搔痒油涂良。
[Prescription Verse] Shanlou (Eel Fistula) arises between the calf muscles, with orifices resembling drilled holes and exuding continuous serous fluid. It closely resembles eczema caused by damp-heat; fumigation and washing with mugwort decoction alleviate itching and lead to recovery.
[Annotation] This condition is caused by damp-heat. Initially, it resembles eczema, appearing on the calf with simultaneous itching and pain. Upon rupture, yellow fluid oozes continuously without cessation. The orifice is deep like a drilled hole. If cold pathogen invades the wound, it causes coldness at the mouth/orifice and cold skin/muscle. The treatment method involves boiling mugwort leaves and old scallions in water for daily fumigation followed by washing. When the wound feels hot and itchy, apply Huangla Gao (Yellow Beeswax Ointment) to promote contraction and healing.
Formula: Huangla Gao (See [Yue Lian] Chuang)
[Prescription Verse] Sibafeng (Four-Bend Wind) occurs in the bends of the legs and feet, recurring monthly and being most lingering. Its appearance resembles wind-xuan (wind tinea) due to wind-pathogen invasion; scratching breaks the skin into sores with unbearable itching.
[Annotation] This condition appears in the popliteal fossae and ankle bends, recurring monthly. Its morphology resembles wind-xuan, resulting from wind-pathogen invading the couli (interstices of skin and muscle). The lesions are unceasing; scratching leads to rupture and exudation, resembling wet-tinea. The treatment method involves boiling one sheng of barley in water for fumigation and washing, followed by applying Sanmiao San (Three-Awesome Powder) to drain dampness and eliminate parasites. The lesions will cease, and gradual efficacy will be achieved.
Formula: Sanmiao San (See Abdominal Umbilical Carbuncle)
[Prescription Verse] Fengju (Wind Ulcer) arises in the concave areas of the lower leg. Scratching causes skin damage, exuding juice and pus. Wind-pathogen remains within the blood vessels, causing irritability, fever, dizziness, muscle swelling, and pain.
[Annotation] This condition appears on the tibia and in concave areas. Scratching damages the skin, exuding yellow fluid that is extremely viscous and thick. It results from wind-pathogen lingering and struggling within the blood vessels. Due to its deep root, it is named Ju (ulcer). In severe cases, the body experiences irritability and fever, dizziness, redness penetrating the muscles, and increased swelling and pain. It is suitable to take Fangfeng Tang (Saposhnikovia Decoction) and externally apply Qingzhu Dadou You (Green Bamboo Soybean Oil) for immediate effect.
Formula: Fangfeng Tang
Composition: Fangfeng (Radix Saposhnikoviae), Fuzi (Prepared Radix Aconiti Lateralis Preparata), Mahuang (Honey-fried Herba Ephedrae), Baizhi (Radix Angelicae Dahuricae), Mutong (Caulis Akebiae), Chaihu (Radix Bupleuri), Danggui (Baked Radix Angelicae Sinensis), Jiegeng (Radix Platycodonis), Gancao (Roasted Radix Glycyrrhizae), Qianghuo (Rhizoma et Radix Notopterygii) (each 5 fen).
Grind into coarse powder. Add one and a half zhong of water, decoct until eight parts remain. Clarify and remove dregs. Take after meals, and again before sleep. If sweating is desired, wait until fasting state, filter the dregs from the first decoction, and consume both doses together. Afterward, eat thin porridge with ginger, cover with blankets, lie down to induce sweating, and avoid wind.
[Prescription Verse] Fangfeng Tang treats wind-pathogen frying and struggling, remaining in blood vessels causing exudate and rupture. It contains Fuzi, Mahuang, Baizhi, Mutong, Chaihu, Danggui, Jiegeng, Gancao, and Qianghuo.
Another Formula: Qingzhu Dadou You (Green Bamboo Soybean Oil)
Composition: Cut a three-chi long green bamboo tube with a diameter of one and a half cun. Fill the tube with one sheng of black beans. Use bran and horse manure as fuel to roast the bamboo tube. Collect the oil juice using porcelain bowls at both ends. First, wash the affected area with warm rice-washing water mixed with salt, dry it, and immediately apply the bean oil. Not exceeding three applications yields extreme effectiveness.
[Prescription Verse] Cut a three-chi long green bamboo tube, fill with black beans having a one-and-a-half-cun diameter, roast the tube burning bran and horse manure; applying this oil for wind-itch is beneficial.