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Wang Kentang stated: Huan Ju (Slow Abscess) is a condition where the heat manifests slowly, failing to suppurate after many days. Over time, the skin and flesh turn dark red-purple and necrotic, hence the name "Huan Ju" (Slow Abscess).
This arises from cold pathogenic factors deeply lodged between the bones of the legs and knees; treatment should employ warming and tonifying methods. (From *Yixue Zhunsheng*)

*Yizong Xinfa* states: Huan Ju is formed by deep invasion of external cold, leading to blood stasis and coagulation. It appears above both knees or on the sides of both knees, swelling hard like a steamed bun, with increasing numbness and pain, and a purple-dark color, failing to suppurate after many days. The clinical presentation resembles Xia Shi Ju (Lower Stone Abscess), except for the presence of heat; prolonged swelling leads to rotting of muscles and skin. The treatment follows the same principles as those in the Carbuncle and Ulcer section.

Shen Douyuan stated: Xia Bi (Lower Thigh/Knee Bend) is also known as Xi Wan Yong (Knee Bend Carbuncle). This occurs when the Kidney Meridian contracts cold-dampness, which attacks the Bladder Meridian, causing blood coagulation and Qi stagnation, with wind-cold failing to dissipate, thus forming this syndrome. Treatment should utilize Qianjin Neituo San (Thousand-Gold Internal Support Decoction) added with Mutong (Akebiae Caulis), Cheqianzi (Plantaginis Semen), Heshouwu (Polygoni Multiflori Radix), and Danzhuyez (Lophatheri Folium). (From *Waike Xuanyuan*)

Wei Zhong Du (Popliteal Fossa Abscess)
Wang Kentang stated: Wei Zhong Du occurs at the crease behind the knee, specifically within the medial fold of the popliteal fossa. It is hard as stone, slightly red and swollen, and belongs to the Shaoyang Gallbladder Meridian. It results from accumulated heat in the Zang-Fu organs flowing into the Bladder. If treatment is delayed even slightly, tendon contraction will occur, inevitably leading to disability. (From *Yixue Zhunsheng*)

Shen Douyuan stated: Wei Zhong Du arises in the inner curve of the knee, caused by obstruction of Qi and Blood in the Kidney Meridian. (From *Waike Xuanyuan*)

*Yizong Xinfa* states: Wei Zhong Du occurs at the Weizhong Acupoint. (The acupoint is located in the depression at the center of the transverse crease behind the knee. The "Yue Wen" refers to the crease, also known as the Xueqi Acupoint, belonging to the Bladder Meridian, commonly called the leg hollow.) The classic text states: Wei Zhong Du is formed because accumulated heat from the Gallbladder Meridian flows into the Bladder, becoming obstructed and unable to circulate. The affected area is woody-hard, painful, swollen, and slightly red, with difficulty in flexion and extension. Treatment should rapidly employ methods to invigorate blood and resolve stasis, driving out the foul blood below for efficacy; if delayed, tendon contraction will lead to disability. All books state that puncturing the Weizhong Acupoint to release blood will cause the disease to subside. However, one must only puncture the acupoint if there are concomitant symptoms of lower back pain and inability to move the body freely. Even then, bleeding should not be excessive; too much blood loss can cause the patient to collapse and lose facial color. There are cases where the pain is severe, the color is bright red, and it suppurates quickly; these are caused by the condensation of damp-heat.