正在小腹与大腿折纹缝中交界之际，两胯合缝之间，初起如核，渐大如卵，坚硬木痛，
微热不红，寒热交作，多由强力房劳，忍精不泄，或欲念不遂，以致精搏血液，聚于中途，
壅遏而成。或因暴怒伤肝，气滞血凝而发，生在左为鱼口，生在右为便毒，生在小腹之下、
阴毛之旁者，名曰横 ，又名曰外疝，非鱼口便毒也。生于肾囊之后、肛门之前，名曰悬痈
，又名曰海底漏。治法宜散滞、行瘀、通利。初起宜内服加减消毒散，加延胡索二钱，外用
三奈、香附共研末，蜜调敷之，如已溃即宜补养气血之剂，不然，恐变生别症。
加减消毒散，阳毒初起者皆可用之。蒲公英三钱，金银花二钱，元参一钱，赤芍二钱，
连翘一钱，炒山甲一片，皂角刺尖七分，前胡一钱，防风一钱，制香附一钱，生甘草七分，
加延胡索二钱，水煎服之，自能消散。
飞罗面，黄豆面，鸡蛋清调敷，外用桑皮纸盖贴，每日早、晚换二次。
又方∶远志肉一两，用甘草汤炒，以酒、水各半碗煎服，次日可消。
又方∶生大黄一两研细末，枯矾三钱，酒调冲服。
又方∶闹羊花。其人强壮者用七分，体气虚弱者用四分，芫花钱半，金银花三钱，淮牛
膝、独活各一钱，水煎服。吃酒者加黄酒入内更妙。初起三日内者，不过三服即消，凡服此
药者，忌服甘草。
Located at the junction of the lower abdomen and the crease of the thigh, as well as between the seams of both hips. Initially appearing like a nut, it gradually enlarges to the size of an egg, becoming hard, numb, and painful, with slight heat but no redness, accompanied by alternating chills and fever. This is often caused by strenuous sexual activity, retaining semen without ejaculation, or unfulfilled desires, leading to the binding of essence and blood, accumulation in the mid-path, and obstruction. It may also arise from violent anger injuring the Liver (Zang organ), causing Qi stagnation and Blood coagulation. When occurring on the left, it is called Yukou; when on the right, it is called Biandu. When occurring below the lower abdomen beside the pubic hair, it is named Hengxuan (a complication of syphilis), also known as Waishan, which is not Yukou or Biandu. When occurring behind the scrotum and before the anus, it is named Xuanyong (perianal abscess), also known as Haidilou. The treatment method should focus on dispersing stagnation, promoting Blood circulation, and unblocking collaterals. In the initial stage, it is suitable to take internally Jiajian Xiaodu San (Modified Disinfection Powder) with added Yanhusuo (Corydalis Rhizome) 2 qian; externally, apply San Nai and Xiangfu ground into powder, mixed with honey. If already ulcerated, it is suitable to use formulas that tonify Qi and Blood, otherwise, other complications may arise.
Jiajian Xiaodu San can be used for all cases of Yang Du (Yang Toxin) in the initial stage. Pugongying (Dandelion Herb) 3 qian, Jinyinhua (Honeysuckle Flower) 2 qian, Yuan Shen (Scrophularia Root) 1 qian, Chi Shao (Red Peony Root) 2 qian, Lian Qiao (Forsythia Fruit) 1 qian, Chao Shan Jia (Stir-fried Pangolin Scale) 1 pian, Zao Jiao Ci (Gleditsia Spine) 7 fen, Qian Hu (Peucedani Radix) 1 qian, Fang Feng (Saposhnikovia Root) 1 qian, Zhi Xiang Fu (Processed Cyperi Rhizoma) 1 qian, Sheng Gan Cao (Raw Licorice Root) 7 fen, plus Yanhusuo (Corydalis Rhizome) 2 qian. Decoct in water and take orally; it will naturally dissipate.
Feiluo Mian (fine flour), Huangdou Mian (soybean flour), mixed with Jidan Qing (Egg White) for external application, covered with Sangpi Zhi (Mulberry Bark Paper), changed twice daily, morning and evening.
Another prescription: Yuanzhi Rou (Polygalae Radix flesh) 1 liang, stir-fried with Gancao Tang (Licorice Decoction), decocted with half a bowl of wine and half a bowl of water, taken orally; it can dissipate the next day.
Another prescription: Sheng Dahuang (Rhubarb Rhizome) 1 liang, ground into fine powder, combined with Kufan (Alumen), mixed with wine and taken orally.
Another prescription: Yaoyanghua (Rhododendron Molle Flower). For robust individuals, use 7 fen; for those with weak constitution, use 4 fen. Add Yuanshan Hua (Croton Seed) half qian, Jinyinhua (Honeysuckle Flower) 3 qian, Huai Niuxi (Achyranthes Bidentata Root) and Duhuo (Angelica Pubescens Root) each 1 qian. Decoct in water and take orally. Adding Huangjiu (Yellow Wine) is better for those who drink alcohol. For cases within three days of onset, three doses are sufficient for dissipation. Those taking this medicine must avoid Gan Cao (Licorice Root).