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Mr. Wu Tianwei of Linxi, aged seventy-three, returned from a sojourn elsewhere and accidentally fell from a horse, injuring himself. He suffered pain in the left hypochondrium, which healed after treatment. Half a year later, he suddenly experienced swelling and pain in the left groin, accompanied by aversion to cold and feverish sensations, making movement extremely difficult. Various local physicians attributed the condition to damp-phlegm, wind-pathogen, or damp-heat, but none of the treatments were effective.

Hearing that Master Hong, a surgeon from Shexian, was skilled in surgery and also knowledgeable about miscellaneous diseases, they invited him to treat the patient. After a few days, Master Hong diagnosed it as hernia (Shan Qi) and administered herbs such as Litchi Seed, Big Fennel Fruit, Small Fennel Fruit, Sichuan Chinaberry Fruit, and Tangerine Seed. The patient's pain and restlessness became unbearable, leading him to attempt suicide with a rope. His sons comforted and persuaded him at length, after which Master Hong resigned, still unaware of the actual disease.

Wu Kai zhi, the patient's son-in-law and my cousin, invited me to examine him. I found the pulse floating and surging-rapid in all six positions, particularly pronounced in the left Cun position. Inspecting the painful area, I observed redness, swelling, brightness, and edema resembling a gourd; it felt hot to the touch. I stated, "This is a perineal abscess (Bian Yong). Master Hong is a specialist in surgery; why did he overlook this? It is likely because he is usually cautious and, seeing the patient's advanced age, dared not diagnose it as a perineal abscess." This was probably a minor oversight among many considerations, nothing surprising. Hearing my words, the gentlemen were startled and questioned me, saying, "Our father has abstained from sexual intercourse for ten years; how could he have contracted this? We beg you to reconsider." I replied, "This is not caused by sexual indulgence. The groin belongs to the Foot Jueyin Liver Meridian. The Liver is the Sea of Blood. The previous fall from the horse resulted in incomplete resolution of blood stasis, which accumulated in the meridians without an outlet, transforming into pus. Due to his advanced age and Qi deficiency, compounded by excessive use of aromatic-drying herbs that depleted healthy Qi, the pus could not rupture and discharge, resulting in diffuse edema. The color is greenish-black, indicating thick, necrotic pus. External incision with a needle is required to drain the pus, and internally, Qianjin Tuoli San (Thousand-Gold Supporting Interior Decoction) should be used to promote pus discharge and flesh regeneration. However, out of compassion, I cannot bring myself to use needles. My brother, Sun Jingwu, is a skilled surgeon; please invite him to decide on the procedure."

Upon arrival, Sun Jingwu immediately inserted a needle more than one cun deep, draining approximately five to six bowls of dark green-black pus, which had a foul odor. He then told the gentlemen, "Had this been decided three days earlier, a month of suffering could have been avoided. Now, immediate vigorous tonification is necessary; recovery will take at least one hundred days. This is commonly known as 'Stone Rice Sore'." Seeing the nature of the pus, the gentlemen and the patient finally believed my diagnosis was correct and urgently requested prescription. I prescribed Neituo Shixuan San (Interior-Supporting Ten-Accumulation Dispelling Powder), with Ginseng Root and Astragalus Root each at 3 qian per dose, later increased to 5 qian, administered twice daily. After two months, the pus was completely discharged, and the flesh regenerated, leading to recovery. The entire market marveled at the outcome.