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[Xue Ji] For leg carbuncles (leg abscess), the meridians involved differ, and consequently, the treatment methods vary. Those occurring on the medial side belong to the Liver Meridian and Spleen Meridian; those on the lateral side belong to the Gallbladder Meridian and Stomach Meridian. Diffuse swelling with induration indicates deficiency of Yuan Qi (Original Qi); use Neibu Huangqi Tang (Internal Tonification Decoction of Astragalus). High-rising swelling indicates that Yuan Qi is not yet deficient; use Nituo Chaihu Huangqi Tang (Internal Support Decoction of Bupleurum and Astragalus), combined externally with Garlic-Separator Moxibustion (Ge Suan Wen Fa). If blood stasis lingers without resolving, or if pus fails to form, use Xianfang Huoming Yin (Immortal Life Elixir). If Qi and Blood are too weak to ulcerate, or if flesh fails to regenerate, use Tuoli San (Supporting Interior Powder). This outlines the general principles.

A child suffered from a toxic sore on the anterior-medial aspect of the thigh. After ulceration, the area remained swollen, hard, and dark-colored, with thin pus that failed to heal, and the complexion was greenish-yellow. This indicated Spleen deficiency with Liver hyperactivity, compounded by Cold pathogen invading the affected site. The primary approach should be to strengthen Yuan Qi. Initially, Yigong San (Extraordinary Skill Powder) was administered with added Chaihu (Bupleuri Radix) and Shengma (Cimicifugae Rhizoma), along with Scallion-Moxibustion (Cong Wen Fa). As Spleen Qi gradually recovered and the lesion improved, it was supplemented with Bazhen Tang (Eight Treasures Decoction) and Fermented Soybean Cake (Douchi Bing), leading to recovery.

Another child presented with painful swelling on the lateral thigh, with normal skin color. Two doses of Tuoli Xiaodu San (Supporting Interior and Detoxifying Powder) resulted in reddening of the swelling; four more doses reduced the redness; six further doses led to ulceration with thin pus discharge, accompanied by poor appetite and fatigue. Yigong San was used with added Xiong (Chuanxiong Rhizoma) and Gui (Danggui Radix), while Tuoli San continued to tonify Yuan Qi, resulting in recovery.

A third child exhibited diffuse induration with unchanged skin color, indicating Yang Qi deficiency preventing pus formation. Tuoli San and Rusheng Bing (Rusheng Cake) were applied. When the swelling rose and turned red, Tuoli Xiaodu San was switched to, leading to pus maturation, which was then incised. Subsequently, Bazhen Tang with Rougui (Cinnamomi Cortex) promoted gradual recovery. Following food stagnation causing vomiting and diarrhea, the lesion turned pale white with anorexia; Liujun Zi Tang (Six Gentlemen Decoction) with Ganjiang (Zingiberis Rhizoma) was given first, followed by Bazhen Tang and Scallion-Moxibustion for cure.

A fourth child had a chronic non-healing lesion with thin pus, sallow complexion, abdominal distension with visible veins, indicating Spleen Qi deficiency with Liver overacting upon the Spleen. Bu Zhong Yi Qi Tang (Tonify the Middle and Augment the Qi Decoction) was taken in the morning, and Wuwei Yigong San (Five-Ingredient Extraordinary Skill Powder) in the evening. Once Yuan Qi slightly recovered, Siwei Fei'er Wan (Four-Ingredient Child-Nourishing Pill) and Scallion-Moxibustion were added, leading to recovery after two months.

A fifth child had a lump on the lateral thigh. After taking detoxifying herbs, the swelling worsened, limbs became emaciated, appetite decreased, and pain intensified. I stated: Swelling preceding pain indicates injury to Form affecting Qi; pain preceding swelling indicates injury to Qi affecting Form. Yang Qi must be supplemented. Disregarding this advice, the patient continued with draining and purgative herbs, resulting in death. *Jiyao* states: When Ying and Wei Qi are abundant but obstructed from flowing, causing Qi and Blood blockage, putrefaction, and carbuncle formation, one should use draining methods to reduce excessive heat. However, if dietary intake is insufficient, spirit is depleted, Qi and Blood are weak, muscles are thin, leading to shortness and stagnation of Ying and Wei Qi, where Cold binds the Couli (pores/skin interstices), causing closure and carbuncle formation, one must use tonifying methods to support deficient Qi. This is indeed true!