赤紫丹瘤，皆心火内郁而发。赤如丹砂，故名曰丹，因热毒客于皮肤，搏于气
血，而风乘之，阴滞于阳，即发丹毒。热极生风，片刻之间，游走遍体，虚热则痒，实
热则痛。自腹而达于四肢者，易治；自四肢而归于腹者，难疗。书虽有五色之分，十月
之异，总不出血热，而属于心。心火内炽，客风外乘，风胜则庶物皆摇，故令游走殊
速。名之丹者，以应心火而色赤也。色红者生，白者气虚挟痰，紫者毒盛，色青如苔
者，死。赤者名赤游丹，热毒感之深也。其状赤肿，片片如胭脂涂染，或发于手足，或
发于头面胸背，令儿躁闷腹胀，其热如火，痛不可忍，游走遍体，流行甚速，须急治
之。若一入腹入肾，即不可救。白者名曰游风，感风湿之轻症也。其候流块作痒，壮热
憎寒，鼻塞脑闷，咳嗽吐逆，其治之法，赤者清凉解毒，甚则砭去恶血，以药涂之。白
者不过疏散渗湿而已。火灼疮者，先天之热毒也。火走空窍，故必于口鼻眼目阴囊粪门
之处，红点如痈，渐成红泡，逾日而穿，赤色无皮，如汤火 炙之状，痛苦殊甚，睡卧
不安，一二日间，周身能腐。若至囟门肿起，阴毒肿亮者不治。及一切丹毒入脏，脐
突出浆，面颊紫浮，噎气不乳，手足拳禁，大小便绝，胸背血点，舌生黑疮，心胸紫肿
者，皆为不治。然小儿脏腑娇嫩，凡一切丹毒，必先内服解毒，方可外敷，盖毒易入难
出，肌肉受伤，其害轻，脏腑受伤，其害速耳。
赤色和紫色的丹瘤，都是由于心火在内郁结而引发的。颜色像丹砂一样红，所以称为“丹”，这是因为热毒侵袭皮肤，与气血搏结，风邪趁机侵入，阴气阻滞于阳气之中，从而引发丹毒。热势极盛则生风，在片刻之间，病邪游走遍全身，虚热表现为瘙痒，实热表现为疼痛。从腹部向四肢蔓延的，容易治疗；从四肢向腹部回缩的，难以治愈。医书虽然将丹毒分为五色、对应十月，但总归不出血热的范畴，且归属于心脏。心火在内炽盛，外受风邪侵袭，风邪偏胜则万物动摇，因此导致病邪游走速度极快。命名为“丹”，是因为它对应心火且颜色为红色。颜色红的预后良好（生），白色的属于气虚兼有痰湿，紫色的表示毒邪强盛，颜色青得像苔藓一样的，预后不良（死）。红色的称为“赤游丹”，说明热毒感之深重。其症状表现为红肿，一片片如同胭脂涂抹，可能发于手足，也可能发于头面胸背，使患儿烦躁闷乱、腹胀，体温高如火烧，疼痛难忍，病邪游走全身，流行速度极快，必须紧急治疗。如果病邪一旦进入腹部或肾脏，就无法救治了。白色的称为“游风”，是感受风湿的轻症。其症状表现为流注肿块并伴有瘙痒，高热恶寒，鼻塞头脑昏闷，咳嗽呕吐，治疗方法上，红色的用清凉解毒法，严重时需用砭石刺破排出恶血，再用药外涂。白色的只需疏散风邪、渗利湿气即可。火灼疮，是先天性的热毒所致。火邪走窜空窍，所以必然在口、鼻、眼、目、阴囊、肛门等处出现如痈疽般的红点，逐渐形成红色水泡，过一天后破溃，露出赤色无皮的组织，如同被汤火烫伤一般，痛苦非常严重，睡眠不安，一两天内周身肌肤可能腐烂。如果囟门肿起，阴毒肿胀光亮者，无法治疗。以及所有丹毒传入内脏，出现脐部突出流脓，面颊紫暗浮肿，吞咽困难不能吃奶，手足蜷曲拘禁，大小便闭塞，胸背部出现血点，舌头上生出黑色疮疡，心胸部位紫暗肿胀的，都属于无法治疗的绝症。然而小儿脏腑娇嫩，凡是遇到一切丹毒，必须先内服解毒药物，然后才能外敷药膏，因为毒邪容易进入却难以排出，肌肉受伤危害较轻，脏腑受伤危害迅速且严重。
Chi (red) and zi (purple) Danliu (Dan tumors/erysipelas-like lesions) are all caused by the internal stagnation of Heart Fire. The color is red like cinnabar, hence named "Dan" (Cinnabar/Erysipelas), because heat-toxin invades the skin, contends with Qi and Blood, and Wind takes advantage to invade; Yin stagnates within Yang, resulting in Dan Du (Erysipelas). Extreme heat generates Wind, causing the pathogen to wander throughout the body within moments. Deficient heat manifests as itching, while excess heat manifests as pain. When the condition spreads from the abdomen to the limbs, it is easy to treat; when it retreats from the limbs to the abdomen, it is difficult to cure. Although texts classify Dan Du into five colors corresponding to ten months, it ultimately falls under blood-heat and belongs to the Heart. With Heart Fire blazing internally and external Wind invading, excessive Wind causes all things to tremble, thus making the pathogen wander extremely fast. It is named "Dan" because it corresponds to Heart Fire and its color is red. A red color indicates a favorable prognosis (Sheng), white indicates Qi deficiency with phlegm accumulation, purple indicates severe toxin, and a cyan color resembling moss indicates an unfavorable prognosis (Si). Red type is called Chi You Dan (Red Wandering Erysipelas), indicating deep infection of heat-toxin. Its presentation includes redness and swelling, appearing in patches like rouge applied to the skin, occurring on hands and feet or head, face, chest, and back. It causes the infant to be irritable, distended, with high fever like fire, unbearable pain, rapid wandering throughout the body, and requires urgent treatment. If the toxin enters the abdomen or Kidneys, it becomes incurable. White type is called You Feng (Wandering Wind), representing a mild case of Wind-Damp invasion. Symptoms include flowing masses with itching, high fever with aversion to cold, nasal congestion, head heaviness, cough, and vomiting. Treatment for the red type involves cooling and detoxifying; in severe cases, Bian Shi (Bian stone/thin stone) is used to puncture and remove bad blood, followed by topical application. The white type requires only dispersing Wind and promoting dampness drainage. Huo Zhu Chuang (Fire-Burned Sore) is due to congenital heat-toxin. Fire moves through hollow orifices, so red spots resembling carbuncles appear at the mouth, nose, eyes, scrotum, and anus, gradually forming red blisters that rupture after a day, leaving raw red flesh without skin, resembling burns from boiling water or fire, causing extreme pain, restlessness during sleep, and potential whole-body tissue necrosis within one to two days. If the fontanelle swells up, or if Yin toxins swell brightly, it is incurable. Furthermore, any Dan Du entering the Zang organs, presenting with umbilical protrusion and pus discharge, purple and swollen cheeks, inability to swallow or suckle, clenched fists and limbs, cessation of urination and defecation, blood spots on chest and back, black ulcers on the tongue, or purple swelling in the heart and chest region, are all considered incurable. However, since infants have delicate Zang-Fu organs, for all types of Dan Du, internal administration of detoxifying herbs must precede topical applications, because toxins enter easily but exit with difficulty; injury to muscles is less harmful, whereas injury to Zang-Fu organs causes rapid and severe damage.