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[Prescription Verse] Nao Hou Fa (Abscess at the Back of the Head) occurs in the Du Meridian. Heat accumulation at Fengfu (GV16) causes millet-like swelling and pain. Reddish and vibrant lesions that easily suppurate with thick pus indicate a favorable prognosis; purplish-dark lesions that are difficult to suppurate and discharge bloody fluid indicate a ominous prognosis.

[Annotation] This condition belongs to the Du Meridian, located below the occipital bone at Fengfu (GV16). It is caused by the confluence of accumulated internal heat and external wind pathogenic factors. Initially, it resembles a millet grain, presenting with burning swelling and pain, radiating to the vertex, shoulders, and neck, accompanied by coarse breathing and nasal congestion. It gradually enlarges to the size of a plate or bowl. Lesions that are reddish-vibrant and rapidly suppurate with thick pus are considered favorable (Shun); those that are purplish-dark, difficult to suppurate, and continuously discharge serous or bloody fluids are considered unfavorable (Ni). For initial treatment, both internal and external methods should follow the guidelines for Yuzhen Ju (Abscess at the Jade Pillow). All other internal and external treatments should refer to the "Chapters on Carbuncles, Ulcers, Swellings, and Ulcerations."

[Prescription Verse] Nao Shuo (Abscess at the Crown-Back) resembles a horizontal log. It arises from the depletion of essence and blood, allowing toxic fire to ascend. The lesion appears black like soot and hard as ox lips. Before suppuration, clear fluid may flow while the area feels numb and painful. Urgently apply Sangchai Hong (Mulberry Wood Roasting) and Aizhuang Jiu (Moxa Cone Moxibustion), stopping when pain is felt. Burning pain resembling fire indicates involvement of Yang meridians; administer Xianfang Huoming Yin immediately. If Seven Evil signs appear, the prognosis is definitely poor.

[Annotation] This condition initially manifests at Fengfu (GV16) of the Du Meridian, caused by the depletion of Yin essence, allowing toxic fire to invade. Initially, it resembles a pepper grain, being hard and purplish-dark. It gradually swells like a horizontal log, potentially extending up to the vertex and down to Dazhui (GV14). The color resembles soot, and hardness resembles ox lips. Before suppuration, the skin may rot first, discharging clear fluid, with cold muscles. Mild cases present with numbness and pain; severe cases involve toxin sinking inward, resulting in complete loss of sensation. Urgently apply Sangchai Hong (Mulberry Wood Roasting) and Aizhuang Jiu (Moxa Cone Moxibustion), using pain as the indicator. Administer Xianfang Huoming Yin promptly to resolve toxicity. After seven days, if new tissue does not grow and large pus does not form, administer Shiquan Dabu Tang for rescue. If tonifying herbs are ineffective, the condition is difficult to treat. If the onset presents with burning heat and stabbing pain, it is a Yang syndrome; administer Huanglian Xiaodu Yin internally and apply Guiyang Yulong Gao externally. If the Five Good signs persist throughout the course, it is favorable; if the Seven Evil signs appear, it is unfavorable. All other internal and external treatments should refer to the "Chapters on Carbuncles, Ulcers, Swellings, and Ulcerations."

Formulas: Sangchai Hong Method, Aizhuang Jiu Method (see Volume Preface); Xianfang Huoming Yin (see Chapter on Pre-ulcerative Conditions); Shiquan Dabu Tang (see Chapter on Post-ulcerative Conditions); Huanglian Xiaodu Yin (see preceding section on Baihui Ju); Guiyang Yulong Gao (see Chapter on Pre-ulcerative Conditions).