The *Lunxin Jing* (Classic of the Cranium and Fontanelle) records: Tianlei Dan (Heavenly Thunder Erythema) begins from the head and neck.
For the above, use sun-dried scallions mixed with red powder and animal fat to apply externally. Alternatively, mix kiln bottom soil with egg white for topical application.

In the *Chao Shi Bing Yuan* (Source of Diseases in Children by Chao Yuanfang), regarding the syndrome of Tianhuo Dan (Heavenly Fire Erythema) in children: The erythema spreads over the entire body, appearing as red patches burning like fire, hence it is called Tianhuo Dan.
According to *Taiping Shenghui Fang* (Prescriptions of Benevolent Sages): In children, erythema erupts within the flesh, appearing red like cinnabar; when the red area is large, it may be as big as a hand; in severe cases, the whole body becomes red and itchy, thus named Tianhuo Dan.
From *Lunxin Jing*, a prescription for Tianhuo Dan starting from the abdomen and back and spreading over the body:
Use birch bark white powder mixed with raw oil for topical application. One may also use litharge and sheep fat mixed for application.
From *Qianjin Fang* (Essential Prescriptions Worth a Thousand Gold), treating Tianhuo Dan in children where redness like cinnabar appears in the flesh, large areas as big as a hand, or in severe cases covering the whole body, accompanied by pain, itching, or swelling:
Take two sheng of adzuki beans, grind into powder, mix with egg white to form a thin paste, apply topically, and change when dry. This prescription is convenient and effective for all types of erythema.
Another prescription from *Qianjin Fang*:
Apply raw sesame oil topically.
From *Taiping Shenghui Fang*, treating Tianhuo Dan in children spreading over the body with redness like crimson color, this prescription is suitable:
Sesame oil (five he) and fresh crucian carp (half jin).
Grind these ingredients into a paste and apply to the erythema; reapply when it dries.
Another prescription from *Taiping Shenghui Fang*:
Tiger fat (two liang) and lead tetroxide (one liang).
Grind these ingredients into an ointment and apply; recovery will follow.
Another prescription from *Taiping Shenghui Fang*:
Mash guimu (fruit of Euonymus), squeeze out the juice, and apply to the red areas.
Another prescription from *Taiping Shenghui Fang*:
Crush renzi (perilla seeds) to extract juice and apply.
Another prescription from *Taiping Shenghui Fang*:
Collect the water from the burial pit of a child's placenta wrapped in a cake, give one or two he to the child to drink, and also apply to toxic areas on the body.
Zhang Huan's Danshen San (Salvia Powder) prescription: Treats erythema spreading over the body, red as crimson, with severe itching and pain, which is named Tianhuo Dan.
Danshen (Salvia miltiorrhiza root), Sanggen Baipi (Cortex Mori), Gan Juhua (Chrysanthemum flower), Mangcao (Agastache rugosa herb) (each one liang).
Grind into coarse powder. For each dose, take three spoonfuls, decoct in three bowls of water until reduced to two bowls, strain, check temperature, and bathe the child in a wind-free place. (Both *Taiping Shenghui Fang* and *Yingru* agree. *Taiping Shenghui Fang* uses one and a half liang of chrysanthemum.)