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Chen Shigong stated: "Yao Gu Ju" (Bone-Biting Abscess) occurs in the medial thigh. There is no swelling or redness, but the pain penetrates to the bone marrow. Initially, it is suitable to treat with Lei Huo Zhen (Thunder-Fire Needle), and internally administer Wan Ling Dan (Ten Thousand Spirits Pill) mixed with wine for ingestion. (*Waike Zhengzong*)

Wang Shengzhi stated: "Jimen Yong" (Abscess at Jimen Acupoint) arises near the knee on the medial thigh, caused by damp-toxin accumulation in the Foot-Taiyin Splein Meridian. (*Waike Lili*)
He further stated: "Gu Du Zhi Chuang" (Bone-Toxin Stagnant Ulcer), also known as "Tui Fa" (Leg Eruption). It occurs along the Foot-Taiyin Splein Meridian at the Jimen acupoint on the leg. If painful, it is treatable; if painless, it is difficult to treat. At twelve days post-onset, it may be lanced. If the pus is yellow-red, it is treatable; if the pus is green, thin, and foul-smelling, it is incurable. If the ulcer surface is red-white, this indicates the manifestation of bone-toxin qi externally. If suppuration does not occur within ten days, death is inevitable.

Shen Douyuan stated: "Rou Wu Feng" (Flesh-Winged Bee) arises on the lateral thigh. The skin shows no obvious redness or swelling, but internal pain is unbearable. When treating this condition, one must absolutely avoid using a knife to lance it. If mistakenly lanced, the toxic qi will penetrate directly into the heart and chest, causing unceasing pain, often leading to untreatable outcomes. Treatment should involve applying Bai Jiang Dan (White Reduction Powder) onto a plaster patch. After three days, remove the patch. When necrotic tissue resembles bee wings, use flesh-regenerating medicines to complete the healing. (*Waike Qixuan*)

Hu Gongbi stated: The site where "Rou Wu Feng" arises belongs to the region of the Foot-Jueyin Liver Meridian. It is formed by long-term stagnation of wind-dampness and obstruction of qi and blood. Once lanced with a knife, the bee toxin enters the heart and chest directly. The mother organ transmits the pathogen to the son organ, allowing the toxin to spread recklessly and attack the Monarch (Heart), hence most cases are fatal. (*Qingnang Mibian*)

Chen Shigong stated: "Xuan Ju" (Dark Carbuncle) arises three cun below the crease between the legs on the left side. It presents with diffuse swelling extending to the genitalia, with pain radiating to the thigh. (*Waike Zhengzong*)

Chen Shigong stated: "Yin Ju" (Yin Carbuncle) arises three cun below the crease between the legs on the right side. The pain extends to the testicles, and the lower abdomen is also painful. (*Waike Zhengzong*)

*Yizong Xinfa* stated: "Xi Yong" (Knee Abscess) occurs on the knee, presenting with redness, swelling, and pain, indicating an excess syndrome of qi and blood. "Xi Ju" (Knee Carbuncle) also occurs on the knee, with swelling similar to an abscess but without color change, accompanied by alternating chills and fever, indicating a deficiency syndrome of qi and blood. Softness of the lesion is a favorable sign; hardness like stone is an unfavorable sign. The classic text states: Small intersections of muscle are called "Xi". The "Xi" refers to the two elbows, two knees, and two wrists. Whenever Spleen disease manifests in the "Xi", Kidney pathogens tend to linger in the two loins. All tendon diseases belong to the joints. Since tendons are the surplus of the Liver, they also belong to the Liver. Therefore, diseases in the "Xi" and joint intersections are all caused by pathogenic factors from the Spleen, Kidney, and Liver meridians invading the body. Only when both knees are simultaneously affected is it considered a failing syndrome, which is untreatable.