1. Origin Background
San Zhong Kui Jian Tang (散肿溃坚汤), or Disperse Swelling and Ulcerate the Hard Decoction, is a classical Jin-Yuan formula from Li Dongyuan’s Lan Shi Mi Cang (Secrets from the Orchid Chamber). It belongs to the category of formulas that clear Heat-toxin, move Qi and Blood, soften hardness, and disperse scrofulous swellings.
This formula addresses hard, stone-like sores and scrofula (Ma Dao Chuang and Luo Li) along the Shaoyang and Yangming channels—below the ear, in the supraclavicular fossa, on the shoulder, or under the ribs—caused by constrained Fire, Phlegm, and Blood stasis. Typical signs include firm, non-ulcerating or poorly draining swellings, a bitter taste, irritability, a red tongue with yellow coating, and a wiry rapid pulse.
Combining Huang Qin, Huang Lian, Huang Bai, Long Dan Cao, and Zhi Mu to drain constrained Fire from the San Jiao and Liver-Gallbladder, Lian Qiao, Tian Hua Fen, and Jie Geng to clear toxin and dissipate clumps, Kun Bu to soften hardness and transform Phlegm, San Leng and E Zhu to break Blood stasis and attack stubborn masses, Chai Hu, Sheng Ma, and Ge Gen to course Qi and raise the formula to the neck and chest, and Dang Gui with Bai Shao to nourish and move Blood, San Zhong Kui Jian Tang disperses swelling and helps hard toxins either scatter or ripen and drain.
2. Neck Diseases
This formula is frequently referenced for conditions involving hard nodules in the neck area.
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Scrofula (Lymphatic nodules): If a patient presents with hard, immovable masses in the neck that do not change skin color, San Zhong Kui Jian Tang can be used to address the underlying heat-toxin and phlegm. It is particularly relevant when the patient also shows signs of liver depression (bitter taste, irritability) or underlying yin deficiency (fatigue, night sweats).
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Thyroid Nodules: For nodules that feel firm or hard, especially when accompanied by emotional stress or a sense of "stuck" qi in the chest, the formula helps by soothing the liver and softening the nodules. It aims to reduce the size of the mass and improve the overall local environment of the neck.

3. Breast Diseases
The formula is often considered for breast issues rooted in stagnation and phlegm-dampness.
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Breast Hyperplasia (Mastopathy): If a patient experiences distending breast pain that changes with their menstrual cycle, accompanied by emotional low-mood or a feeling of fullness in the chest, this formula can be beneficial. Chai Hu (Bupleurum) helps relieve the breast distension, while San Leng (Sparganium) and E Zhu (Curcuma) work to dissolve the underlying stagnation.
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Small Fibroids: In cases where small, hard breast lumps are identified and the patient shows symptoms of "liver-stomach disharmony" (poor digestion, mood fluctuations), the formula acts to improve the systemic circulation. By addressing the accumulation of phlegm and blood stasis, it can assist the body in regulating these benign growths.