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The *Ling Shu* states: When a carbuncle occurs on the lower leg, it is named "Rabbit Bite" (Tubi). Its appearance resembles a red bean extending deep to the bone; it must be treated urgently. If not treated promptly, it will endanger life.

A question was raised: On the medial side of the calf, there is slight redness and swelling, hardness like stone for about three or four cun, with unbearable pain. What is this? The answer is: This is named "Yellow Loach Abscess" (Huangqiu Yong). It belongs to damp-heat in the Foot-Taiyin Spleen and Foot-Jueyin Liver meridians, caused by accumulated resentment and anger. It is suitable to take Wuxiang Tang (Five Fragrances Decoction) or Liqi Yin (Flowing Qi Drink), added with Xuexi (Radix Achyranthis Bidentatae), Mugua (Fructus Chaenomelis), Fangji (Radix Stephaniae Tetrandrae), and Huangbai (Cortex Phellodendri). For those with strong constitutions, Yili Jindan (One Pill Golden Elixir) can be used to purge toxins, or Wanbing Jiedu Dan (Ten Thousand Diseases Detoxifying Pill). For those with deficient constitutions, Shiquan Dabu Tang (Decoction for Complete Great Tonification) added with Xuexi and Mugua is appropriate. If it ulcerates late and discharges clear fluid, with rising deficiency fire, vomiting, and inability to eat, it is incurable.

The *Gui Yi Ke* states: When carbuncles and sores arise at both sides of the Zusanli point, initially appearing dark green-black like an ox's eye, they break open after five to seven days, discharging black bloody pus. The abscess attacks the bladder and abdomen, extending into the legs, causing spasms, cold pain, and stiffness. This is formed due to injury to the sinews and qi from labor and overexertion. It is suitable to apply herbal decoctions externally to inject or wash the area, allowing the toxin to subside naturally.

The *Gui Yi Ke* states: At one location near the upper part of the calf, below the ankle joint on both feet, a Dan Ju (erysipelas-like sore) arises, the size of a walnut, hard as if beaten by an object. It does not cause severe pain but presents with urgent swelling and distension. One should worry about damage to the sinews; it is necessary to discharge the pus and toxin early to ensure safety.

The *Gui Yi Ke* states: When sores arise at the left and right sides of the scrotal pendulum, it is called "Pian Ma Zhui" (Deceiving Horse Fall). Initially, the size varies. The skin here is thin yet firm, with tight texture, and the wound mouth is difficult to close. At the initial stage, it is suitable to apply dissipating medicines topically to resolve it internally. This location is also prone to forming fistulas. Only dissipating methods are suitable; if it becomes hard, progress may be slow and ineffective. It further states: At the Huiyin point, near the perineal raphe, it is also called Pian Ma Zhui. Prevention of fistula formation is required (commonly known as Cross-Horse Carbuncle).

A question was asked: A mass forms below the calf, about two or three cun long, accompanied by severe chills and fever, and loss of appetite. What is this? The answer is: This is named "Green Snake Urination" (Qingshe Bian). It belongs to the Foot-Shaoyin Kidney and Foot-Taiyang Bladder meridians, caused by Kidney meridian deficiency and downward pouring of damp-heat. Those with the head pointing upward are difficult to treat. Those with the head pointing downward should have pricked to release foul blood, followed by taking Huoming Yin (Life-Saving Drink) added with Mugua, Xuexi, and Huangbai, or alternatively selecting Wu Jin San (Black Gold Powder) or Zi Jin Dan (Purple Gold Pill). For elderly and weak individuals presenting with vomiting, abdominal distension, confusion, and rapid/irregular pulse, the prognosis is fatal.
When Qingshe Bian arises above or below the calf, if the head grows upward attacking into the abdomen, it is incurable. If the head grows downward and the tail is upward, it is considered a favorable progression and is treatable. Urgently take Ershiliu Wei Tuoli San (Twenty-Six Ingredient Interior-Supporting Powder); externally apply Shenfang Tiegu San (Divine Formula Iron-Fence Powder) mixed with ginger juice, aged vinegar, and pig bile. The treatment principle is "directing upwards towards downwards" (guiding the toxin downward). Use a three-edged needle on the snake's head, inserting two cun deep to discharge black-purple blood. After removing the needle, immediately administer Bao Sheng San (Life-Preserving Powder), using a paper twist dipped in medicine to guide the intake.