火针（又名燔针）为外症所必用，能决脓痈，消散阴疽，惟红肿 痛，火毒旺者。误用，
更肿痛深溃。头面为诸阳总会，一用火针，引火闭邪，使轻病转危矣。
隐曲处，生痈疽，脓水日久溃多。夫脓为血液，与肌肉所化而成。血脉已枯，束骨
之筋，失其滋养，故筋缩，不得屈伸。待完口时，外以青葱新艾，煎汤，先熏后洗，内
进十全大补汤。俾气旺血充，筋得舒润，再加时常以手揉抹患上或扯之左，或拽之右，或
伸之前，或屈之后，不拘手足身体，如此行之无间，约月余则骨节可活，气血可通，筋
脉可舒，自必撤消归旧。若肌肉烂深，大筋已断，虽然肌生口敛，必有曲无直，或直不
得曲，终成废疾。
腿足生痈疽，脓水去多，筋无荣养，故易短缩。乘完口时，用二尺长酒杯粗竹子一
段，带于身旁，时常放地上，将患足蹋其上，推转来去，活动筋脉，约月余，即和活如旧
矣。
痈疽溃脓，日久内肉烂空，外皮浮软，上下有孔流脓，中间薄皮，搭住如桥，使毒护
塞，不能尽性掺药，难以完功。用剪刀将浮皮剪开，自可任意上药，易于收口。
手背乃三阳经脉之部，生疮忌用升药，助火蚀肌，宜清火燥湿药掺之。膝盖下至足背
生疮，皆湿热下注居多，尤忌用升药，闭湿生火，须以利水清火药外掺。
火针（又名燔针）是治疗外科病症所必须使用的疗法，能够排脓消痈，消散阴疽。但对于红肿疼痛、火毒旺盛的患者，如果误用火针，会导致肿痛加剧且溃烂更深。头面部是诸阳经汇聚之处，一旦使用火针，会引火闭邪，使轻症转为危重。
在隐蔽弯曲处生发痈疽，若脓水日久流出过多，会导致筋脉收缩，无法屈伸活动。这是因为脓液由血液和肌肉转化而成，脓水流失过多导致血脉枯竭，束缚骨骼的筋脉失去滋养，从而发生筋缩，不能屈伸。等到疮口即将愈合时，外用青葱和新艾叶煎汤，先熏蒸后清洗，内服十全大补汤。使得气血旺盛充盈，筋脉得到舒润，再加上经常用手揉抹患处，或者向左拉扯、向右拽动、向前伸展、向后弯曲，不限手足身体部位，如此不间断地操作，大约一个月后关节即可灵活，气血通畅，筋脉舒展，自然能恢复如初。如果肌肉腐烂较深，大筋已经断裂，虽然肌肉生长、疮口收敛，但必然只能弯曲不能伸直，或只能伸直不能弯曲，最终成为残疾。
腿足部位生发痈疽，若脓水排出过多，筋脉缺乏荣养，容易短缩。趁着疮口将愈之时，取一段两尺长、酒杯粗细的竹子带在身边，经常放在地上，用患脚踩在上面，来回推转，以活动筋脉，大约一个月后，就能恢复如旧般灵活。
痈疽溃破流脓，日久内部肌肉腐烂中空，外皮浮软，上下有孔流脓，中间薄皮搭住如同桥梁，导致毒邪壅塞，药物难以完全渗透发挥作用，难以痊愈。用剪刀将浮皮剪开，就可以随意上药，易于收口愈合。
手背是三阳经脉分布的部位，生疮忌用升药，以免助火蚀肌，宜用清火燥湿的药物掺敷。膝盖以下至足背生疮，多因湿热下注所致，尤其忌用升药，以免闭湿生火，须用利水清火的药物外掺。
Fire needle (also known as burning needle) is a therapy essential for treating external diseases; it can drain pus and dissipate carbuncles, and resolve yin abscesses. However, for patients with redness, swelling, pain, and vigorous fire-toxin, the mistaken use of fire needles will cause increased swelling and pain, leading to deeper ulceration. The head and face are the convergence point of all Yang meridians; once fire needles are used, they may draw fire and close pathogens, turning mild conditions into critical ones.
When carbuncles or abscesses arise in hidden or curved areas, prolonged discharge of pus can lead to tendon contraction and inability to flex or extend. This is because pus is transformed from blood and muscle tissue. Excessive loss of pus depletes the blood vessels, causing the tendons binding the bones to lose nourishment, resulting in tendon contraction and restricted movement. When the wound is about to heal, apply fresh green onions and new mugwort decocted in water externally: fumigate first, then wash. Internally administer Shiquan Dabu Tang (Ten Great Tonifying Decoction). This ensures abundant Qi and blood, allowing tendons to relax and moisten. Additionally, frequently massage the affected area with hands, or pull left, pull right, extend forward, or bend backward, regardless of whether it involves limbs or body. By performing this continuously without interruption for approximately one month, joints will become flexible, Qi and blood will circulate freely, and tendons and vessels will relax, naturally restoring the original state. If muscle rot is deep and major tendons are severed, although muscle growth and wound closure occur, there will inevitably be only flexion without extension, or only extension without flexion, ultimately resulting in disability.
When carbuncles or abscesses arise on the legs and feet, excessive discharge of pus deprives tendons of nourishment, making them prone to shortening. While the wound is healing, carry a piece of bamboo two chi long and the thickness of a wine cup nearby. Place it on the ground frequently and step on it with the affected foot, rolling back and forth to mobilize the tendons and vessels. After about one month, flexibility will return to normal.
When carbuncles and abscesses ulcerate and discharge pus for a long time, internal flesh may rot and become hollow, while the outer skin becomes floating and soft. There may be holes above and below discharging pus, with thin skin bridging the middle like a bridge. This traps toxins and prevents medicines from penetrating fully, hindering complete healing. Use scissors to cut open the floating skin, allowing unrestricted application of medicine, which facilitates wound closure.
The dorsum of the hand is the region of the three Yang meridians. Sores here should avoid using Sheng Yao (Ascendant Medicine), as it aids fire and erodes muscle; instead, sprinkle powders of heat-clearing and damp-drying herbs. Sores arising from below the knee to the dorsum of the foot are mostly caused by damp-heat sinking downward. The use of Sheng Yao is especially contraindicated here, as it closes dampness and generates fire; rather, sprinkle powders of diuretic and heat-clearing herbs externally.