（丹火附）
《巢氏病源》小儿火丹候∶火丹之状往往如伤寒赤着身，而日渐大者，谓之火丹候。
《巢氏病源》小儿丹火候∶丹火之状，发赤如火之烧，须臾 浆起是也。
《婴孺》云∶火丹者，往来如伤寒赤着身体，不从伤火而得名。赤如日出时，以从其处，又名日丹。宜同用
《千金》漏芦汤。治小儿热毒痈疽，赤白朱丹疮疖。（漏芦汤方见痈门。）
《千金》治小儿火丹赤如朱，走皮中方。
上以醋和豉研，敷之。
《千金》又方
上鲤鱼血敷之，良。
《千金》又方
上捣荏子敷之，良
《千金》又方
上猪屎水和，绞取汁，服少许良。
《仙人水鉴》治火丹疮方。
荞面 黄连（各少许）
上同研令细，涂之立瘥。切不得入油及盐。
《广利方》∶小儿火丹，热如火绕腰即损。
上杵马齿菜敷之，日二。
《婴孺》治小儿火丹走皮中赤者方。
上栀子末以醋和，敷之。
《婴孺》又方
上鲤鱼杵烂，或片拓之。
《婴孺》治小儿天火丹者，凡小儿肉中有赤如丹色，大者如手极，遍身赤痒而微淫者方。
上小豆二升为末，鸡子白和，封之。遍身者合涂之令遍。
《婴孺》治小儿火丹方。
上取不犯水羊脂向火上炙，敷丹上，以白粉粉之，大良，无忌。
[Appendix on Huodan]
*Zhubing Yuanhou Lun* (Source of All Diseases) regarding the condition of pediatric Huodan: The manifestation of Huodan often resembles Taiyang disease (disease of the Taiyang channel) with redness spreading over the body, enlarging day by day; this is termed the Huodan syndrome.
*Zhubing Yuanhou Lun* regarding the syndrome of pediatric Danhuo: The appearance of Danhuo involves skin turning crimson like a fire burn, with blisters arising within moments.
*Yingru Shu* states: Huodan manifests intermittently with redness on the body similar to Taiyang disease; it is not named after injury by fire. Its redness resembles the sunrise, hence it is also called Ridan (Sun Dan). It is appropriate to jointly use Loulu Tang (Ludang Root Decoction) from *Qianjin Fang*. This formula treats pediatric heat-toxin carbuncles and sores, as well as Chi Bai Zhudan sores and boils. (The prescription for Loulu Tang is found in the Carbuncle section.)
*Qianjin Fang* treats pediatric Huodan where the skin is crimson like cinnabar and moves within the dermis.
Take fermented soybeans (Chidou), grind them with vinegar, and apply externally.
Another prescription from *Qianjin Fang*:
Apply blood from a common carp (Cyprinus carpio) externally; it is effective.
Another prescription from *Qianjin Fang*:
Grind seeds of Perilla frutescens (Shenzi) and apply externally; it is effective.
Another prescription from *Qianjin Fang*:
Mix pig feces with water, squeeze out the juice, and ingest a small amount; it is effective.
Prescription for treating Huodan sores from *Xianren Shuijian*:
Buckwheat flour (Fagopyri Esculenti Semen) and Rhizoma Coptidis (Huanglian) (each in small amounts).
Grind these together into a fine powder and apply topically for immediate recovery. Strictly avoid adding oil or salt.
*Guangli Fang* records: In pediatric Huodan, if the heat wraps around the waist like fire, it causes damage.
Pound fresh Portulaca oleracea (Machixiancai) and apply externally twice daily.
*Yingru Shu* treats pediatric Huodan moving within the skin causing redness.
Take powder of Gardenia jasminoides fruit (Zhizi), mix with vinegar, and apply externally.
Another prescription from *Yingru Shu*:
Pound common carp flesh until paste-like, or slice and apply to the affected area.
*Yingru Shu* treats pediatric Tianhuodan (Heavenly Fire Dan), characterized by crimson, dan-colored rashes within the flesh of children, large ones up to the size of a palm, covering the whole body with itching and slight exudation.
Take two sheng of Vigna angularis (Xiaodou/Adzuki bean), grind into powder, mix with egg white (Jizi Bai), and apply as a compress. If covering the whole body, apply thoroughly over the entire surface.
*Yingru Shu* treats pediatric Huodan.
Take sheep fat (Yangzhi) that has not been exposed to water, roast it over fire, and apply it onto the Dan lesion, then dust with white powder (Baifen); this is highly effective and free from contraindications.