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From the Weili (Tailbone) point and the anus to the buttocks and thighs, all hemorrhoids, fistulas, sores, and carbuncles in this region are compiled here for easy reference and treatment.

The *Ling Shu* states: A lesion occurring on the sacrum is called Rui Ju (Sharp Carbuncle). Its presentation features redness, hardness, and swelling. It requires urgent treatment; if untreated, death will occur within thirty days.

The *Gui Yi Fang* records: Yongquan Ju (Carbuncle at Yongquan), characterized by swelling and rupture, involves the Tai Yin meridian (referring to the area anterior to the sacrum and tail). If it resembles a lurking mouse and is not punctured within twenty days, death ensues. Puncture may be performed after ten days. Prognosis is poor if clear or dark red/black pus is discharged, but favorable if white pus appears.

Chen Shigong states: This condition arises from the deficiency of the Three Yin meridians, with turbid qi and damp-phlegm flowing and knotting in the Du Mai (Governing Vessel). The lesion occurs at the high bone tip above the Weili point. Initially, it resembles a fish bladder; later, it protrudes like an ibis's beak. Patients experience chills in the morning and fever in the evening, with symptoms lighter during the day and heavier at night. After ulceration, thin pus flows uncontrollably, or fresh blood bleeds incessantly. While young adults may recover, the prognosis for the elderly is critical. (*Waike Zhengzong*)

Wang Shengzhi states: In the initial stage, nourish Yin and drain Dampness. Once abscessed, harmonize Qi and nourish Ying. After ulceration, nourish Kidney Jing and preserve Yuan Qi. If it persists into a fistula, administer Hupo La Wan (Amber Wax Pill) and Xiantian Da Zao Wan (Pre-heaven Great Creation Pill) concurrently. (*Waike Lili*)

Gu Shicheng states: Guan Kou Ju (Ibis Mouth Carbuncle) is difficult to heal in the elderly and weak, prone to forming fistulas.

Weili Fa (Eruption at Weili)
Wang Kentang states: Weili Fa occurs at the Weili point, governed by the Du Mai. It is extremely painful and difficult to suppurate. (*Waike Zhunsheng*)
He also states: When the disease occurs at the coccyx, toxic nodules form the size of plums or peaches, presenting with redness, swelling, and pain, rendering movement impossible.

Shen Douyuan states: Cases resulting from exertion or prolonged sitting causing blood stasis and Qi stagnation are easier to treat. Cases resulting from excessive sexual activity or holding back ejaculation, leading to Du Mai deficiency, will likely become fistulas upon rupture and are difficult to cure. (*Waike Qixuan*)

Tun Yong (Buttock Abscess)
Wang Kentang states: High swelling with a shallow root is Tun Yong; flat swelling with a deep root is Tun Ju. Both are caused by Damp-Heat in the Foot-Taiyang Bladder Meridian. (*Waike Zhunsheng*)

Xue Lizhai states: The buttock is the domain of the Foot-Taiyang Bladder Meridian, located posterior to the lower abdomen. It is "Yin within Yin," distant in pathway and remote in location. Although the Taiyang meridian is rich in blood, Qi circulation rarely reaches it, and blood flow is scarce. Thus, individuals past middle age should particularly guard against this affliction. Treatment should avoid damaging the Spleen and Stomach or depleting Qi and Blood, focusing instead on consolidating the Root.

Chen Shigong states: Tun Yong arises posterior to the lower abdomen, in a remote and obscure location where Qi rarely reaches and blood seldom arrives. It results from the accumulation and stagnation of Damp-Heat. This condition must be treated by expelling toxins outward to prevent internal invasion. If the toxin originates from internal organ accumulation, the lesion will have a head, appearing red, swollen, heavy, and stone-hard, accompanied by internal dry mouth and fever. Treatment should promote the clearance of accumulated heat externally using Jin Huang San (Golden Yellow Powder) paste applied around the periphery to draw out stagnant pus and blood, combined internally with tonifying and expelling methods for self-healing. Misuse of cold-natured detoxifying herbs or external cooling applications causes Qi and Blood to congeal like ice, trapping toxins and forcing them inward. If the sore head becomes soft and sunken without pus, the base spreads flatly without pain, and symptoms include dry mouth, irritability, delirium, phlegm-wheezing, coarse breathing, and mental restlessness, these are untreatable. Most cases (80-90%) arise from internal toxin accumulation spreading outward; only 1-2% result from external Wind-Cold, Summer-Heat, or Heat invading inward. Recurrence with internal penetration indicates a fatal outcome. (*Waike Zhengzong*)

Shen Douyuan states: Tun Ju belongs to the Foot-Taiyang Bladder Meridian, which is rich in blood but deficient in Qi. Lesions at the Chengfu point are most painful and require expulsion therapy. Those arising in solid muscle tissue are easier to treat; those near the urethra or anus are difficult to treat. (*Waike Qixuan*)

Feng Luzhan states: Sores erupting on the buttocks are caused by Damp-Toxin steaming and heating in the Bladder, or by congenital Yin deficiency. This area is least likely to rise high and suppurate effectively. Therefore, interior-tonifying and suppuration-promoting methods are essential. (*Waike Jinnang*)

Zhu Danxi states: Tun Yong occurs on the upper buttocks near the thigh, caused by Damp-Heat invasion and the coagulation of Qi and Blood into郁毒 (stagnant toxin). The shape resembles a large plate, with broad swelling extending over a chi, covering the waist upward and obscuring the crotch downward. This is "Yin within Yin." One must vigorously dissipate Heat, extract Toxins, greatly tonify Qi and Blood, cultivate the Kidneys and Stomach, and nourish the roots. Only then can blood gather easily, pus form readily, toxins exit smoothly, and Heat dissipate. Otherwise, swelling persists for years, and pain deepens daily. Hence, those past middle age must beware. Upon seeing weakness, immediate tonification ensures good outcomes. Misuse of cooling and detoxifying agents internally and externally causes Qi and Blood to congeal further due to cold, often leading to untreatable conditions.