【方歌】足发背属胆胃经，七情六淫下注成，详别善恶分顺逆，
细辨疽痈定死生。
【注】此证一名足跗发。凡足背虽行三阳，而遍在胆胃二经居
多。证由七情内郁，或兼六淫外伤而成。经云：三背不
宜生疮。惟足背多筋多骨，肉少皮薄，又在至阴之下，
发疮疽者，升发迟慢，所以谓为险候也，宜别五善、七
恶而分顺逆。发背者，大疮之通名也。须当细辨，或疽
或痈，顺逆既分，则生死定焉。初宜服仙方活命饮，及
隔蒜灸之，令疮速溃，。余与肿疡、溃疡门治同。
方剂：仙方活命饮（见肿疡门）
隔蒜灸法（见首卷灸法）
【方歌】涌泉疽发在足心，肾虚湿滞多属阴，速破溃浅痈可治，
黑陷为疽命难存。
【注】此证生在足心涌泉穴，一名足心发，又名穿窟天〔虫也
〕，俗名病穿板，属足少阴，由肾经虚损，兼湿热下注
而成。若十四日内即溃，脓浅为痈，犹可调治，初服仙
方活命饮，外用神灯照法。虚甚脓生迟者，十全大补汤
；溃后兼用桂附地黄丸服之。余治按痈疽肿疡、溃疡门
。若黑陷不疼，二十一日之内不溃脓者为疽，属阴败之
证难救。
方剂：仙方活命饮（见肿疡门）
神灯照法（见首卷）
十全大补汤（见溃疡门）
桂附地黄丸（见面部疮疡）
【方歌】足发背属于胆经和胃经，由七情内郁或六淫外感下注而成，详细辨别善恶以区分顺证与逆证，仔细辨析是疽还是痈以确定生死预后。
【注】此病证又名足跗发。凡是足背部虽然行走着三条阳经，但病变多位于胆经和胃经所过之处。此证由七情内郁，或者兼夹六淫外伤而形成。医经云：三处背部不宜生疮（指头、背、足等部位）。唯独足背部筋多骨少，肌肉薄皮肤浅，又处于人体最下部（至阴之下），发生疮疽时，气血升发迟缓缓慢，所以称之为险恶之候，应当辨别五善、七恶来区分顺证与逆证。“发背”是大疮的通称。必须仔细辨别，或是疽或是痈，顺逆既然分辨清楚，那么生死预后也就确定了。初期适宜服用仙方活命饮，并配合隔蒜灸法，使疮疡迅速溃破。其余治疗与肿疡门、溃疡门的治疗原则相同。
【方歌】涌泉疽发生在足心，因肾虚湿滞多属阴证，若迅速溃破且脓液浅表为痈，尚可治愈；若出现黑陷则为疽，性命难保。
【注】此证生于足心的涌泉穴，又名足心发，又名穿窟天（一种虫名），俗名病穿板，归属于足少阴肾经，由肾经虚损，兼夹湿热下注而形成。如果在十四日内即行溃破，脓液浅表者为痈，还可以调治，初期服用仙方活命饮，外用神灯照法。若虚损严重导致脓生成迟缓者，服用十全大补汤；溃破后兼用桂附地黄丸服用。其余治疗参照痈疽肿疡门、溃疡门。如果出现黑陷且不疼痛，二十一日之内不溃脓者为疽，属于阴败坏之证，难以救治。
[Prescription Verse] Foot dorsum abscess belongs to the Gallbladder and Stomach meridians, formed by the downward pouring of seven emotions [internal factors] and six pathogenic influences [external factors]. Carefully distinguish between good and bad signs to classify as favorable or unfavorable courses; meticulously differentiate between carbuncle (ju) and furuncle (yong) to determine life and death prognosis.
[Annotation] This condition is also known as "Foot Dorsum Eruption." Although three Yang meridians traverse the dorsal aspect of the foot, lesions are most commonly located in the areas governed by the Gallbladder and Stomach meridians. The condition arises from internal stagnation of the seven emotions, or combined with external injury by the six pathogenic influences. The Classics state: "Sores should not arise on the three backs [head, back, soles]." Specifically, the foot dorsum has many tendons and bones but little flesh and thin skin, and it is situated at the lowest point of the body (the extreme Yin). When sores or carbuncles erupt here, the ascending and transforming Qi rises slowly, thus it is termed a dangerous condition. One must distinguish between the Five Good Signs and Seven Bad Signs to classify the course as favorable or unfavorable. "Dorsum eruption" is a general term for large sores. It must be carefully differentiated; whether it is a carbuncle or a furuncle, once the favorable or unfavorable nature is determined, the prognosis of life or death is fixed. Initially, Xian Fang Huo Ming Yin (Immortal Life Elixir) should be taken, and garlic-partitioned moxibustion applied, to cause the sore to suppurate quickly. The remaining treatment follows the principles of the Swelling Ulcer Section and Ulcer Section.
Formula: Xian Fang Huo Ming Yin (Immortal Life Elixir) (See Swelling Ulcer Section)
Garlic-Partitioned Moxibustion Method (See First Volume, Moxibustion Methods)
[Prescription Verse] Yongquan Carbuncle occurs on the sole of the foot, often belonging to Yin patterns due to Kidney deficiency and dampness stagnation. If it suppurates rapidly with shallow pus, it is a furuncle and can be treated; if black depression occurs, it is a carbuncle and life is difficult to save.
[Annotation] This condition arises at the Yongquan acupoint on the sole of the foot, also known as "Sole Eruption," or "Piercing Cave Heaven" (named after an insect), and colloquially as "Plank-Pierching Disease." It belongs to the Foot Shaoyin [Kidney] meridian, resulting from Kidney meridian deficiency combined with downward pouring of damp-heat. If it suppurates within fourteen days and the pus is shallow, it is a furuncle and can still be managed; initially take Xian Fang Huo Ming Yin (Immortal Life Elixir) externally apply Shen Deng Zhao Fa (Divine Lamp Illumination Method). If deficiency is severe and pus formation is delayed, take Shi Quan Da Bu Tang (Ten Significant Tonifying Decoction); after suppuration, concurrently take Gui Fu Di Huang Wan (Cinnamon and Aconite Rehmannia Pill). Other treatments refer to the Carbuncle/Furuncle Swelling Ulcer Section and Ulcer Section. If there is black depression without pain, and no suppuration occurs within twenty-one days, it is a carbuncle belonging to Yin collapse, a difficult-to-save condition.
Formula: Xian Fang Huo Ming Yin (Immortal Life Elixir) (See Swelling Ulcer Section)
Shen Deng Zhao Fa (Divine Lamp Illumination Method) (See First Volume)
Shi Quan Da Bu Tang (Ten Significant Tonifying Decoction) (See Ulcer Section)
Gui Fu Di Huang Wan (Cinnamon and Aconite Rehmannia Pill) (See Facial Sores Section)