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[Yifa]
This is a pathology of the Foot-Yangming Stomach Meridian. This meridian is characterized by abundant Qi and scarce Blood. The lesion occurs above and below the Jiache (ST6) and Daying (ST5) acupoints, symmetric on both left and right sides. Bilateral occurrence is the most severe. If swelling and pain are intolerable, puncture may be performed on the eighth day. If pus drains out and the surrounding tissue becomes soft, the prognosis is favorable (survival likely); if it remains hard instead, accompanied by trismus (lockjaw), inability to eat, and the ulcer weeping yellow fluid like a honeycomb, mortality approaches 100%. Women suffering from this condition typically die within four to five days.

[Gufa]
This abscess arises in the Hand-Shaoyang Sanjiao (Triple Burner) Meridian. This meridian is characterized by abundant Qi and scarce Blood. The lesion occurs one cun and three fen below the ear, a critical and potentially fatal location. If there is acute redness, swelling, and pain, internal support therapy (Neituo) should be employed. If toxic pus is discharged and swelling subsides, the patient will stabilize; otherwise, it leads to deafness, confusion, internal swelling and pain in the throat, sweating extending to the eyes, and severe pain in the cheeks, shoulders, and elbows. Without early treatment, death is inevitable.

[Yingliufa]
This abscess arises at the midline of the spine, near the ends of the Dazhui (GV14), Taodao (GV13), and Shenzhu (GV12) acupoints. These locations are all connected with the Du Mai (Governing Vessel). The condition is extremely severe and requires early application of support therapy. The Du Mai is the Sea of Yang Meridians and commands all meridians. As stated in the medical classics: "When Ying (Nutrient) Qi does not flow smoothly and reverses into the muscle texture, carbuncles and swellings arise." This indicates that the Du Mai has lost its commanding function, revealing this as a highly ominous syndrome.

[Xiongfā]
This abscess arises at the Yutang (CV19) and other acupoints, which are all connected with the Ren Mai (Conception Vessel). The Ren Mai is known as the Sea of Yin Meridians and represents the vertical axis (Ziwu) of the human body. Early internal support therapy is urgent to prevent toxic vapors from returning to the Heart. Lesions manifesting externally are treatable; however, if the infection originates internally and damages the membrane source (Moyuan), it results in death.

[Efā]
This abscess arises below the Qucha (BL7) acupoint and near the Cuanzhu (BL2) acupoint on the forehead, belonging to the Foot-Taiyang Bladder Meridian. This meridian is characterized by abundant Blood and scarce Qi. Initial symptoms include headache, aversion to cold, stiffness in the neck as if being pulled, sensation of the waist as if broken, and local redness and swelling. Immediate diaphoresis (sweating method) should be applied, prioritizing the expulsion of pathogens from the exterior. Subsequently, treatment should be tailored based on the patient's deficiency or excess patterns.