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*Yi Zong Jin Jian* (Golden Mirror of Medicine) states: Qing Tui Ya Gan (Green Leg and Gum Gangrene), this syndrome is rarely recorded in ancient medical texts, with its name merely passed down. During the Yongzheng reign, Tao Linqi, a military physician attached to the northern route camp, understood its details quite well. He briefly stated: In the army, whenever patients suffer from leg swelling with a bluish color, they must simultaneously develop Ya Gan (Gum Gangrene) above; whenever patients suffer from Ya Gan with rotting blood, they must simultaneously develop Qing Tui (Green Leg) below. These two conditions arise mutually and concurrently. Tracing their origin, it is all due to Yang Fire blazing excessively above and Yin Cold closing and stagnating below, leading to a failure of Yin and Yang Qi to interact between upper and lower parts. Each generates cold or heat independently, condensing to produce this syndrome. It also occurs in areas near the interior regions. Although it exists outside the borderlands, it is not very common. However, among the populace from the interior who first go to the borderlands, eight or nine out of ten contract this syndrome. This is because people from China are inherently不耐 (not resistant to) the bitter wind and cold of the borderlands. Moreover, sitting and sleeping on damp ground causes Phlegm of Cold-Dampness to generate in the lower part, resulting in bluish swelling of the legs and knees. The lesion resembles cloud patches, the color resembles that of an eggplant, the flesh becomes hard and stubborn, making walking difficult. Furthermore, due to the scarcity of grains outside the borders, people consume much beef and mutton. The greasy, fishy, and muttony nature of these foods causes stasis in the Stomach, with Toxic Fire steaming upward, leading to Ya Gan (Gum Gangrene), where gums rot and bleed. If it progresses to perforating the cheeks and lips, with blackish rotting tissue, it indicates a critical prognosis. Outside the borders, there is a tradition of administering Horse Milk (Equus caballus milk). When Tao Linqi first arrived at the military camp to treat Qing Tui Ya Gan, he initially used only Horse Milk. After extensive experience, he realized that the warming property of Horse Brain was inferior to Horse Milk, which yielded twice as fast results. Upon instructing patients to take it, the toxins were expelled that very night, and various symptoms subsided. This is likely because the brain is the head of all Yang meridians, possessing a warm nature and facilitating circulation. Subsequently, Huoluo Liuqi Yin (Circulating-Activating Decoction for Unblocking Collaterals) and Jia Wei Er Miao Tang (Modified Two-Awesome Decoction) were added to promote Qi and Blood circulation, unblock meridians, and prevent toxin condensation. Externally, Bian Fa (Scarification Therapy) was used to let evil blood flow out to kill the toxic pathogen, followed by applying slices of beef to draw out accumulated toxins. Within a few days, recovery occurred. Essentially, when black blood is discharged, Yin Qi leaks outward, and Yang Qi descends following Yin Qi. The two interact harmoniously, bringing peace to both upper and lower parts. Thus, it became a standard method, saving many lives. Not daring to keep it private, he recorded it in a book to share with the world. He further stated: Cases where physical constitution and Zheng Qi (Upright Qi) are exhausted, and there is no desire for food, are incurable. Cases where all teeth fall out, purple-black blood flows, and the tissue rots with a foul odor are incurable. Cases where the legs are massively swollen and rotting, or thin and dry/withered, are incurable.