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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.