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Knee carbuncle (Xigai Yong) occurs at the knee, presenting with redness, swelling, and pain. It belongs to damp-heat fire syndrome and is characterized by an excess condition of Qi and Blood. Ciju (Cigu, a type of deep-seated abscess) also grows on the knee; it swells like a carbuncle but the skin color remains unchanged, accompanied by alternating chills and fever. It belongs to cold coagulation and damp stagnation syndrome, characterized by a deficiency condition of Qi and Blood. Softness upon palpation indicates a favorable prognosis (Shun), while hardness like stone indicates an unfavorable prognosis (Ni). The Classics state: "The small junctions of muscles are called Xi." The so-called "Xi" refers to the two elbows, two knees, and two wrists. Generally, Spleen diseases manifest in the Xi; when the Kidney has pathogenic factors, their Qi tends to remain in both knees; all tendon diseases belong to the joints. Since tendons are the surplus of the Liver, they also belong to the Liver. Therefore, diseases occurring at the Xi and junctions are caused by pathogenic factors from the Spleen, Kidney, and Liver meridians attacking these areas. If both knees are affected simultaneously, it constitutes a failure syndrome (Bai Zheng) and is difficult to treat. Treatment methods: For damp-heat syndromes, clearing heat, promoting diuresis, and detoxifying are appropriate, primarily using Bixie Huadu Decoction (Dioscorea Hypoglauca Detoxification Decoction); for cold-damp syndromes, warming to dispel cold, harmonizing Ying (Nutritive) Qi, and unblocking collaterals are appropriate, primarily using Guizhi Heying Decoction (Cinnamon Twig Harmonizing Nutritive Qi Decoction).

Weizhong abscess (Weizhong Du) occurs at the Weizhong acupoint within the popliteal fossa (the point is located in the depression at the center of the posterior knee crease) and belongs to the Bladder Meridian. The Classics state: Weizhong abscess arises from accumulated heat in the Gallbladder Meridian flowing into the Bladder, causing obstruction and stagnation. The Bladder is a gathering place for dampness; when heat enters and mixes with dampness, it pours into the collaterals to form an abscess, which is invariably caused by the congealing of damp-heat. Initially, the area is woody-hard, painful, swollen, and slightly red, with difficulty in flexion and extension, hence also named "Quqiu" (Crooked Leech). If chills and fever do not subside, pus will form. Treatment should focus on clearing damp-heat, invigorating blood and resolving stasis, relaxing sinews, and dispersing pathogens. If not treated promptly, there is a risk of tendon contraction, leading to disability.

Kneeye toxin (Xiyan Du) occurs on both sides below the patella at the kneeyes, also known as Tuo Ju. The lateral side belongs to the Foot-Shaoyang Gallbladder Meridian, and the medial side belongs to the Foot-Taiyin Spleen Meridian. Initially, there must be soreness and pain in the kneeyes, followed by swelling, pain, and suppuration. It is mostly formed by the accumulation of damp-heat fire, but can also result from Wind pathogens affecting the Kidney Meridian, where cold and damp invade together. The distinction between cold-damp and damp-heat lies in morphology: the former presents with high swelling and red color, while the latter presents with slight swelling and white color. One must carefully distinguish them before treatment to avoid errors.