人有禀性阴阳不和，而心神 塞者，亦有因病而精采暗钝，皆由阴阳之气不足，致
神识不分明。
血之在身，随气而行，常无停积。若因堕落损伤，即血行失度，随伤损之处即停积。若
流入腹内，亦积聚不散，皆成瘀血。凡瘀血在内，颜色萎黄，气息微喘，涩涩小
寒，吸吸微热，或时损痛也。
小儿脏气不和，血虚为冷所乘，即口唇青 。亦有脏气热，唇生疮，而风冷之气
入，疮虽瘥，之后血色不复，故令唇青。
小儿面黄发直，时壮热，饮食不生肌肤，积经日月，遂致死者，谓之无辜。言天上有鸟
，名无辜，昼伏夜游。洗浣小儿衣席，露之经宿，此鸟即飞从上过。而取此衣与小儿着，并
席与小儿卧，便令儿着此病。
风热毒瓦斯客于腠理，热毒搏于血气，蒸发于外，其皮上热而赤，如丹之涂，故谓之丹也
。若久不瘥，即肌肉烂伤。
五色丹，发而变改无常，或青、黄、白、黑、赤。此由风毒之热，有盛有衰，或冷或热
，故发为五色丹也。
丹病，本是毒热折于血气，蕴蒸色赤，而复有冷气乘之，冷热互交，更相积瘀，令色赤
丹，初是热毒挟风，热搏于血，积蒸发赤也。热轻而挟风多者，则其色微白也。
丹火之状，发赤，如火之烧，须臾 浆起是也。
In individuals whose innate constitution presents an imbalance of Yin and Yang, causing obstruction of the Heart Spirit (Shen), or those whose mental clarity and vitality become dull due to illness, all stem from a deficiency of Yin and Yang Qi, resulting in unclear consciousness.
Blood in the body circulates with Qi and typically does not stagnate or accumulate. However, if trauma such as falling causes injury, blood flow loses its normal regulation and stagnates at the site of injury. If it flows into the abdominal cavity, it accumulates without dispersing, forming Blood Stasis (Yu Xue). Whenever Blood Stasis exists internally, the complexion appears sallow, respiration is slightly panting, there is a sensation of slight chills, mild heat, or occasional pain.
When a child's Zang-Fu Qi is disharmonious and Blood Deficiency allows Cold Pathogens to invade, the lips turn cyanotic. Alternatively, if Zang-Fu Qi is hot, sores may form on the lips; when Wind-Cold invades, although the sores heal, the blood color fails to recover, leading to cyanotic lips.
If a child presents with a sallow complexion, straight hair, intermittent high fever, poor nutritional absorption from food intake, and eventually dies after prolonged duration, this condition is termed "Wugu" (Gu Innocence Disease). It is said that a bird named "Wugu" resides in the sky, hiding by day and roaming by night. If children's clothes and mats are washed and left exposed overnight, this bird flies over them. Giving these clothes to the child to wear and these mats for the child to sleep on causes the child to contract this disease.
Wind-Heat Toxic Wastes lodge in the Cou Li (skin texture and intermuscular spaces). Heat-Toxin contends with Blood and Qi, evaporating outwardly. The skin becomes hot and red, resembling applied cinnabar, hence termed Dan (Erysipelas/Carbuncle). If unresolved for a long time, muscles may rot and be damaged.
The Five-Color Dan changes unpredictably upon onset, appearing in green, yellow, white, black, or red. This results from Wind-Toxin Heat fluctuating between excess and deficiency, alternating between Cold and Heat, thus manifesting as Five-Color Dan.
Dan disease originates from Toxic Heat obstructing Blood and Qi, causing steaming and reddening of the color. When Cold Qi invades, Cold and Heat interact and mutually accumulate stasis, maintaining a red hue.
Initially, Dan Fire involves Heat-Toxin accompanying Wind, where Heat contends with Blood, accumulating and evaporating to cause redness. If the Heat is mild but Wind is predominant, the color appears slightly white.
The manifestation of Dan Fire involves redness erupting like burning fire, followed quickly by blister formation.
When Dan erupts across the entire body, presenting as macular erythema resembling burning fire, it is called Tian Huo Dan (Heavenly Fire Erysipelas).