《心法》曰∶鳝漏缘湿热而成。初起颇类湿疮，生于腿肚，痛痒相乘，破流黄水，
绵绵不已，其孔深如钻眼，复受寒气侵入疮口，以致疮寒肌冷，宜每日用艾叶老葱
熬汤先熏后洗，俟疮口发热觉痒时，贴黄蜡膏收敛而愈。（《金鉴》）
《鬼遗方》云∶青蛇便生足肚之下，结
块长二三寸许，寒热大作，饮食不进，属足少阴与足太阳二经，由肾经虚损，湿热
下注所致。头向上者难治，头向下者刺出恶血，如老弱之人呕吐腹胀，神昏脉躁者，必死。
王肯堂曰∶青蛇便生足小膀上下，头生望上攻走入腹者不可治，头生向下尾在上即为顺，可治也。（《准绳》）
申斗垣曰∶青蛇便即青蛇痈，生小腿上，有一条如蛇，大者为头，小者为尾，初起宜表汗。（《启玄》）
《心法》曰∶青蛇毒即青蛇便，生于小腿肚之下，形长二三寸，结肿紫块僵硬，头
大尾小，憎寒壮热，火痛不食，皆由肾经素虚，膀胱湿热下注而成。蛇头向下者毒
轻而浅，急刺蛇头半寸，出紫黑血，随针孔搽拔疔散，外敷离宫锭，内服仙方活命
饮加黄柏、牛膝、木瓜，亦有蛇头向上者，毒深而恶，急刺蛇头一二寸，出紫黑血，针
孔用白降丹细条插入五六分，外贴太乙膏，敷紫金锭，若毒入腹呕吐，腹胀神昏脉躁，俱为逆证。（《金鉴》）
《医宗心法》说：鳝漏是由于湿热之邪引起的。初起时很像湿疮，长在小腿肚上，疼痛和瘙痒交替出现，破溃后流出黄色液体，连绵不断，疮孔深得像钻眼一样，又受到寒气侵入疮口，导致疮口寒冷、肌肉发冷，适宜每天用艾叶和老葱煮汤，先熏蒸后清洗，等到疮口发热、感觉痒的时候，贴上黄蜡膏使其收敛而痊愈。（出自《医宗金鉴》）
《鬼遗方》记载：青蛇便长在足小腿肚下方，结成块状长约二三寸左右，寒热症状剧烈，饮食不进，属于足少阴经和足太阳经的病变，是由肾经虚损、湿热下注所致。头朝上的难治，头朝下的刺出恶血，如果是年老体弱之人出现呕吐腹胀、神志昏迷、脉象躁动者，必定死亡。王肯堂说：青蛇便长在足小腿上下，头生向上攻走入腹的不可治，头生向下尾在上方即为顺证，可以治疗。（出自《医学准绳六要》）
申斗垣说：青蛇便就是青蛇痈，长在小腿上，有一条像蛇一样，大的是头，小的是尾，初起适宜用发汗的方法解表。（出自《外科启玄》）
《医宗心法》说：青蛇毒即青蛇便，长在小腿肚下方，形状长二三寸，结肿成紫黑色块状且僵硬，头大尾小，憎寒壮热，如火灼痛、不能进食，都是由肾经素来虚弱、膀胱湿热下注而成。蛇头向下的毒轻而浅，急刺蛇头半寸，放出紫黑血，随针孔涂抹拔疔散，外敷离宫锭，内服仙方活命饮加黄柏、牛膝、木瓜；也有蛇头向上的，毒深而凶险，急刺蛇头一二寸，放出紫黑血，针孔用白降丹细条插入五六分，外贴太乙膏，敷紫金锭，如果毒气入腹出现呕吐、腹胀、神志昏迷、脉象躁动，都属于逆证。（出自《医宗金鉴》）
*Yizong Xinfa* states: Shanlou (Eel Fistula) arises from damp-heat. In the initial stage, it resembles wet eczema, appearing on the calf, with alternating pain and itching. Upon rupture, yellow fluid flows continuously. The orifice is deep like a drilled hole. If cold pathogen invades the wound, it causes coldness of the wound and muscles. It is appropriate to boil mugwort leaves (*Artemisiae Argyi Folium*) and old scallions daily for fumigation and washing first, then soaking. When the wound becomes warm and itchy, apply Huangla Gao (Yellow Wax Ointment) to promote contraction and healing. (From *Yizong Jinjian*)
*Guiyi Fang* records: Qingshebian (Green Snake Discharge) occurs below the calf, forming a mass about two to three cun in length. Severe chills and fever occur, and appetite is lost. This belongs to the Foot Shaoyin and Foot Taiyang meridians, caused by deficiency and damage of the Kidney meridian with damp-heat sinking downward. Cases where the head points upward are difficult to treat; those where the head points downward should be pricked to release foul blood. In elderly or weak patients presenting with vomiting, abdominal distension, coma, and restless pulse, death is inevitable. Wang Kentang stated: Qingshebian appears above and below the lower leg. If the head grows upward attacking into the abdomen, it is incurable. If the head grows downward with the tail above, it is a favorable condition and can be treated. (From *Yixue Zhunsheng*)
Shen Douyuan stated: Qingshebian is also known as Qingsheyong (Green Snake Carbuncle), appearing on the lower leg like a snake. The larger end is the head, and the smaller end is the tail. In the initial stage, diaphoresis (sweating method) is suitable for releasing the exterior. (From *Waike Xuanyuan*)
*Yizong Xinfa* states: Qingshedu (Green Snake Toxicity) is the same as Qingshebian, occurring below the calf. It is long, two to three cun, forming a swollen, purple-black, stiff mass with a large head and small tail. Symptoms include aversion to cold with high fever, burning pain, and anorexia. All these result from prior deficiency of the Kidney meridian and damp-heat sinking from the Bladder meridian. If the snake's head points downward, the toxicity is mild and superficial; urgently prick half a cun at the head to release purple-black blood. Apply Bading San (Pimple-Pulling Powder) around the needle hole, and externally apply Ligong Ding (Palace-Leaving Plaster). Internally administer Xianfang Huoming Yin (Immortal Formula for Saving Lives Decoction) added with Huangbai (Phellodendri Cortex), Niuxi (Achyranthis Bidentatae Radix), and Mugua (Chaenomelis Fructus). If the snake's head points upward, the toxicity is deep and severe; urgently prick one to two cun at the head to release purple-black blood. Insert a thin strip of Baijiang Dan (White Reduction Cinnabar) five to six fen into the needle hole. Externally apply Taiyi Gao (Supreme One Ointment) and Zijin Ding (Purple Gold Plaster). If the toxicity enters the abdomen causing vomiting, abdominal distension, coma, and restless pulse, all are adverse signs. (From *Yizong Jinjian*)