具列痘疹方末，所当详阅。
痘疮一证，俗曰天疮，原其所由，实由胎毒内藏，而复因时气外触，其毒乃发，故传染相似，
是亦天行疫疠证也。但考之《内经》则止言疡胗，即今斑疹之属也。故自越人、仲景、元化、叔和
诸公皆无一言及痘，可见上古本无是证，而今则何以有之？愚谓近代之毒，必以醉酒五味造作太过，
较古人之恬淡，相去远矣。或者未信余言，第观藜藿膏粱之家即有不同，今之北虏亦不出痘，原其
所由，实由是耳。岂果彼无胎毒耶？故凡多遭此害者，当以余言熟味之。
一、痘疮变纪百出，虚中有实，实中有虚，要非曲学偏见者可以窥其堂室，若目力心思一有不
到，则害不小矣。设或知证而不知形，则无以洞其外；知形而不知脉，则无以侧其内；知脉而不知
本，则无以探其源；知本而不知囚，则无以穷其其变；知因而不知药，则无以神其治。只此数事，
今医果能全之否？设有不能而强以为能，则致害于人，获非于天，能无畏乎？故余十痘疹一门，留
心既久，积验已多，因搜采先哲之最精于此者，如文中陈氏，仲阳钱氏，立斋薛氏，罗田万氏，晨
峰程氏，东皋徐氏，改斋友氏，并其他杂录等书，有述其旧者，有发其未发者，有剖其疑似者，有
因涉历而吐其心得者，尽我愚衷，集而成帙。痘疹玄秘，似无出此。
在本书末尾详细列出了治疗痘疹的方剂，应当仔细阅读。
痘疮这一病症，民间称为“天疮”，追溯其根源，实际上是由于胎毒潜伏体内，又因外界时气触动，导致毒素发作，因此具有传染性且症状相似，这也属于天行疫疠类的病证。但是考证《黄帝内经》，只提到了“疡胗”（皮肤疮疡和疹子），即现在所说的斑疹之类。所以自扁鹊（越人）、张仲景、华佗（元化）、王叔和等各位医家，都没有一句话提到过痘疮，可见上古时期本来没有这种病证，那么为什么现在会有呢？我认为近代的毒性，必定是因为人们过度饮酒以及五味（酸苦甘辛咸）饮食制作太过，这与古人恬淡虚无的生活状态相比，相差甚远。或许有人不相信我的话，只需观察吃粗茶淡饭的人与吃肥美厚味的人，情况就有所不同；现在的北方少数民族也不出痘疮，追溯其原因，确实是因为这个缘故。难道真的是他们没有胎毒吗？所以凡是经常遭受此害的人，应当仔细体会我的话。
一、痘疮的变化记载繁多，虚证中夹杂实证，实证中夹杂虚证，绝不是那些学识偏颇浅薄的人可以窥探其奥妙的。如果眼力心思有一点点不到之处，造成的危害就不小了。假如只知道辨证却不懂得察形（观察形态色泽），就无法洞察体表的病情；只知道察形却不懂得切脉，就无法推测体内的状况；只知道切脉却不懂得求本（探究根本病因），就无法探求疾病的源头；只知道求本却不懂得判断“囚”（指疾病受制于时令或环境的状态），就无法穷尽疾病的变化；只知道病因却不懂得用药，就无法达到神妙的治疗效果。仅这几点，当今的医生果真能全部做到吗？假设有做不到的却强装能做，从而伤害他人，招致上天的谴责，能不害怕吗？所以我研究痘疹这一门类，留心已久，积累的验案很多，于是搜集先哲中最精通于此道的人，如文中的陈氏、钱乙（仲阳）、薛己（立斋）、罗田万氏、程从周（晨峰）、徐春圃（东皋）、改斋友氏，以及其他杂录等书籍，有的叙述旧有理论，有的阐发未发之理，有的剖析疑似难辨之处，有的是因为亲身经历而吐露心得，我竭尽愚诚，集结成册。痘疹的玄妙秘密，似乎没有超出这本书的了。
The formulas for treating smallpox and chickenpox are listed in detail at the end of this book, and should be read carefully.
This condition known as *dou chuang* (smallpox), commonly referred to as "Heaven's Sore" (*Tian Chuang*), originates from latent fetal toxins within the body that are triggered by external seasonal pathogens, causing the toxins to erupt. Consequently, it is contagious with similar symptoms, classifying it also as a type of epidemic pestilence (*Tian Xing Yi Li*). However, an examination of the *Huangdi Neijing* (Yellow Emperor's Inner Canon) mentions only "yang zhen" (skin sores and rashes), which corresponds to modern macules and rashes. Thus, renowned physicians such as Bian Que (Yue Ren), Zhang Zhongjing, Hua Tuo (Yuanhua), and Wang Shuhe never mentioned smallpox in their writings. This indicates that such a disease did not exist in ancient times. Why does it exist now? I believe that the toxicity prevalent in recent times stems largely from excessive indulgence in alcohol and the five flavors (sour, bitter, sweet, pungent, salty) through improper dietary preparation, which differs significantly from the simple and tranquil lifestyle of ancients. If one doubts my words, observe the differences between those who consume coarse food and those who eat rich, fatty foods; furthermore, people in the northern regions do not typically contract smallpox. Tracing the cause, it is indeed due to these factors. Could it truly be that they lack fetal toxins? Therefore, those frequently afflicted by this malady should ponder my words carefully.
First, the variations of smallpox are numerous, with deficiency patterns containing excess elements and excess patterns containing deficiency elements. These cannot be fully understood by scholars with narrow or biased views. If one's observation or mental comprehension lacks precision, the resulting harm can be significant. If one knows how to differentiate the syndrome but fails to examine the physical manifestations, one cannot penetrate the exterior condition; if one examines the manifestations but fails to palpate the pulse, one cannot infer the interior state; if one palpates the pulse but fails to seek the root cause, one cannot explore the origin of the disease; if one seeks the root but fails to understand the constraints imposed by time and environment ("Qiu"), one cannot exhaustively comprehend the disease's transformations; if one understands the etiology but fails to know the appropriate medicinal treatment, one cannot achieve miraculous therapeutic effects. Can contemporary physicians master all these aspects? If one attempts to pretend competence where there is none, thereby harming others and inviting heavenly reprimand, should one not be fearful? Having studied the category of smallpox and chickenpox for a long time and accumulated many verified cases, I have collected the most refined insights from past sages, such as Chen Shi (mentioned in the text), Qian Yi (Zhongyang), Xue Ji (Lizhai), Wan Shi of Luotian, Cheng Congzhou (Chenfeng), Xu Chunpu (Donggao), Gai Zhai You Shi, and other miscellaneous records. Some narrate established theories, some elucidate previously unexplored principles, some analyze ambiguous cases, and some share personal insights gained through experience. With utmost sincerity, I have compiled these into a volume. The profound secrets of smallpox and chickenpox seem to be contained herein without exception.