【方歌】火赤疮由时气生，燎浆水疱遍身成，治分上下风湿热，
泻心清脾自可宁。
【注】此证由心火妄动，或感酷暑时临，火邪入肺，伏结而成
。初起小如芡实，大如棋子，燎浆水疱，色赤者为火赤
疮；若顶白根赤，名天疱疮。俱延及遍身，焮热疼痛，
未破不坚，疱破毒水，津烂不臭，上体多生者，属风热
盛，宜服解毒泻心汤；下体多生者，属湿热盛，宜服清
脾除湿饮。未破者，俱宜蝌蚪拔毒散敷之；已破者，俱
宜石珍散撒之，清其湿热，破烂白干，甚效。
方剂：解毒泻心汤
组成：黄芩 黄连
牛蒡子（炒，研） 知母
石膏（〔火段〕） 栀子（生）
防风 元参
荆芥 滑石（各一钱）
木通 甘草（生，各五分）
水二钟，灯心二十根，煎八分，食远服。
【方歌】解毒泻心汤火赤，芩连牛蒡木通知，石膏栀子防风草，
元参荆芥与滑石。
又方：清脾除湿饮
组成：赤茯苓 白术（土炒）
苍术（米泔水浸，炒） 黄芩
生地黄 麦冬（去心）
栀子（生，研） 泽泻
甘草 连翘（去心）
茵陈蒿 枳壳（麸炒）
元明粉（各一钱）
水二钟，竹叶二十斤，灯心二十根，煎八分，食前
服。
【方歌】清脾除湿天疱疾，赤苓二术芩生地，麦冬栀子草连翘，
茵陈元明同作剂。
又方：石珍散
组成：轻粉 石膏（〔火段〕，各一两）
黄柏末 青黛（各三钱）
共研匀，先以甘草汤洗净疮处，再用此药撒之。
【方歌】石珍散去火邪害，天疱破撒自康泰，一两轻粉〔火段〕
石膏，三钱黄柏加青黛。
又方：蚪蝌拔毒散（见肿疡门）
【方歌】火赤疮由时气生，燎浆水疱遍身成，治分上下风湿热，泻心清脾自可宁。
【注】此证由心火妄动，或感酷暑时临，火邪入肺，伏结而成。初起小如芡实，大如棋子，燎浆水疱，色赤者为火赤疮；若顶白根赤，名天疱疮。俱延及遍身，焮热疼痛，未破不坚，疱破毒水，津烂不臭，上体多生者，属风热盛，宜服解毒泻心汤；下体多生者，属湿热盛，宜服清脾除湿饮。未破者，俱宜蝌蚪拔毒散敷之；已破者，俱宜石珍散撒之，清其湿热，破烂白干，甚效。
方剂：解毒泻心汤
组成：黄芩、黄连、牛蒡子（炒，研）、知母、石膏（煅）、栀子（生）、防风、元参、荆芥、滑石（各一钱）、木通、甘草（生，各五分）。
用法：水二钟，灯心二十根，煎至八分，食远服。
【方歌】解毒泻心汤火赤，芩连牛蒡木通知，石膏栀子防风草，元参荆芥与滑石。
又方：清脾除湿饮
组成：赤茯苓、白术（土炒）、苍术（米泔水浸，炒）、黄芩、生地黄、麦冬（去心）、栀子（生，研）、泽泻、甘草、连翘（去心）、茵陈蒿、枳壳（麸炒）、元明粉（各一钱）。
用法：水二钟，竹叶二十斤，灯心二十根，煎至八分，食前服。
【方歌】清脾除湿天疱疾，赤苓二术芩生地，麦冬栀子草连翘，茵陈元明同作剂。
又方：石珍散
组成：轻粉、石膏（煅，各一两）、黄柏末、青黛（各三钱）。
用法：共研匀，先以甘草汤洗净疮处，再用此药撒之。
【方歌】石珍散去火邪害，天疱破撒自康泰，一两轻粉煅石膏，三钱黄柏加青黛。
又方：蝌蚪拔毒散（见肿疡门）
[Prescription Verse] Huochi Chuang (Fire-Red Blister) arises from seasonal pathogens, with blistering vesicles covering the body. Treatment distinguishes between upper and lower body involvement due to wind-dampness and heat; clearing the Heart and purging the Spleen brings peace.
[Annotation] This condition results from reckless movement of Heart Fire or contraction of summer-heat pathogens during extreme heat. The fire pathogen enters the Lung and becomes latent and knotted. Initially, lesions are small like water chestnuts or large like chess pieces. These are blistering vesicles; those with red coloration are called Huochi Chuang (Fire-Red Blister). If they have white tops and red bases, they are named Tianpao Chuang (Heavenly Blister Disease). Both spread over the entire body, causing burning heat and pain. Unruptured blisters are not firm; upon rupture, toxic fluid oozes out, causing maceration without foul odor. Lesions predominantly appearing on the upper body indicate excess Wind-Heat, for which Jiedu Xiexin Tang (Detoxifying Heart-Purging Decoction) is suitable. Lesions predominantly appearing on the lower body indicate excess Damp-Heat, for which Qingpi Chushi Yin (Spleen-Clearing Dampness-Removing Drink) is suitable. For unruptured lesions, Kedou Baidu San (Tadpole Detoxification Powder) should be applied externally. For ruptured lesions, Shizhen San (Stone Treasure Powder) should be sprinkled externally to clear damp-heat, drying the broken skin effectively.
Formula: Jiedu Xiexin Tang (Detoxifying Heart-Purging Decoction)
Ingredients: Huangqin (Scutellariae Radix), Huanglian (Coptidis Rhizoma), Niubangzi (Arctii Fructus, stir-fried and ground), Zhimu (Anemarrhenae Rhizoma), Shigao (Gypsum Fibrosum, calcined), Zhizi (Gardeniae Fructus, raw), Fangfeng (Saposhnikoviae Radix), Yuan Shen (Scrophulariae Radix), Jingjie (Schizonepetae Spica), Huashi (Talcum) (each 1 qian); Mutong (Akebiae Caulis), Gancao (Glycyrrhizae Radix et Rhizoma, raw) (each 0.5 qian).
Preparation and Administration: Add two zhong of water and twenty roots of Dengxin Cao (Junci Medulla). Decoct until one-eighth remains. Take far after meals.
[Prescription Verse] Jiedu Xiexin Tang treats Huochi Chuang, containing Scutellaria, Coptis, Arctium, Akebia, Anemarrhena, Gypsum, Gardenia, Saposhnikovia, Licorice, Scrophularia, Schizonepeta, and Talcum.
Another Formula: Qingpi Chushi Yin (Spleen-Clearing Dampness-Removing Drink)
Ingredients: Chi Fuling (Poria with Red Hosta Root), Baizhu (Atractylodis Macrocephalae Rhizoma, soil-stir-fried), Cangzhu (Atractylodis Rhizoma, soaked in rice wash water and stir-fried), Huangqin (Scutellariae Radix), Sheng Dihuang (Rehmanniae Radix), Maidong (Ophiopogonis Radix, heart removed), Zhizi (Gardeniae Fructus, raw and ground), Zexie (Alismatis Rhizoma), Gancao (Glycyrrhizae Radix et Rhizoma), Lianqiao (Forsythiae Fructum, heart removed), Yinchenshao (Artemisiae Scopariae Herba), Zhike (Aurantii Fructus, bran-stir-fried), Yuanmingfen (Natrii Sulfas) (each 1 qian).
Preparation and Administration: Add two zhong of water, twenty jin of Zhu Ye (Bambusae Folium), and twenty roots of Dengxin Cao (Junci Medulla). Decoct until one-eighth remains. Take before meals.
[Prescription Verse] Qingpi Chushi Yin treats Tianpao Chuang, containing Poria with Red Hosta Root, two types of Atractylodes, Scutellaria, Rehmannia, Ophiopogon, Gardenia, Licorice, Forsythia, Artemisia Scoparia, and Natrii Sulfas.
Another Formula: Shizhen San (Stone Treasure Powder)
Ingredients: Qingfen (Calomelas), Shigao (Gypsum Fibrosum, calcined) (each 1 liang); Huangbai (Phellodendri Cortex, powdered), Qingdai (Indigo Naturalis) (each 3 qian).
Preparation and Administration: Grind together uniformly. First, wash the lesion area with Gancao Tang (Licorice Decoction), then sprinkle this powder on it.
[Prescription Verse] Shizhen San dispels fire pathogen harm; sprinkling on ruptured Tianpao ensures recovery. One liang of Calomelas and calcined Gypsum, three qian of Phellodendrum and Indigo Naturalis.
Another Formula: Kedou Baidu San (Tadpole Detoxification Powder) (See section on Swollen Ulcers)