一、是书之辑，专论痧疹，其痘、斑、麻、隐等证，未便涉及。惟烂喉丹痧，稍有发明，然亦略而不详。欲
求全义，自有陈耕道《疫痧草》在，故不赘述。
二、治病须明经络。若经络不明，如瞽者夜行。而三焦一经，尤为痧疹伏气第一关键。越人以降，或有形，
或无形，纷纷聚讼。余不惮琐亵，以泰西解体诸书，缕晰辨明，使数千年幽晦复明，庶几长夜一灯，不致暗中摸
索。
三、经络虽明，俞穴难考。汉唐以后，针灸失传，总缘不辨同身取寸之义，致议论分歧，语多隔膜。余折衷
诸家，畅明经旨，泄千余年失传之秘，固豆疹之津梁，实针灸之宝筏。
四、清冷渊、消泺二穴，为三焦经脉。泰西引种之说，引其命门伏毒，由经络外达。此法与牛豆同，倘能推
广行之，亦保婴之一助也。
五、选录诸家精论，当以许橡村首屈一指。其余各有奥义，读者须细心领会，勿轻看过。
六、论治虽无剩义，惟疑似同异之间，病情百变，临证之士惝恍无所适从，故选案数十条，各法略备。其间具
治病原委，览者心目豁然。遇证之偶相类者，用之无疑，效可立俟，庶免望洋之叹。
七、书分四卷。卷分八篇，曰述原，曰引种，曰预防，曰禁忌，曰辨证，曰论治，曰运气，曰选案。每有一
得之愚，附之篇末。高明之士，起而正之，匡其不逮，固鄙人之幸，亦是书之幸也。
八、古人文本，未便割裂。前后之间，难免拉杂。书虽八篇，气则一贯，读者参观互证可也。
九、是书首重畅明医理，未敢以文害义，其重复芜杂之诮，知所不免，阅者谅之。
一、本书的编纂，专门论述痧疹（一种发于肌肤的红色斑丘疹性疾病），至于痘疮、斑疹、麻疹、隐疹等其他证候，不便涉及。唯有烂喉丹痧（以咽喉肿痛溃烂及全身皮肤弥漫性猩红样皮疹为特征的急性传染病），稍有阐发，但也简略而不详尽。若要寻求其完整义理，自有陈耕道的《疫痧草》一书存在，因此不再赘述。
二、治病必须明了经络。如果经络不明，就像盲人夜间行走一样。而三焦经这一条经脉，更是痧疹伏气（潜伏在体内的病邪之气）的关键所在。自扁鹊（越人）以降，关于三焦有形或无形的争论纷纷扬扬。我不怕琐碎轻慢，引用西方解剖学书籍，条理清晰地加以辨析阐明，使数千年来晦涩难懂的道理重新明朗，犹如长夜中的一盏明灯，不至于让人在黑暗中摸索。
三、虽然经络已明，但腧穴难以考证。汉唐以后，针灸技艺失传，总归是因为不辨别“同身寸”（以患者自身身体部位为标准进行测量的取穴方法）的含义，导致议论分歧，言语多有隔阂不通之处。我折衷各家学说，畅达阐明经络旨意，泄露千余年失传的奥秘，这既是豆疹（泛指痘疹类疾病）治疗的桥梁，也是针灸学习的宝贵舟筏。
四、清冷渊穴和消泺穴，属于三焦经脉。西方关于引种（指通过接种牛痘等方式预防天花等传染病）的说法，是引导命门（肾间动气，此处指人体生命本源之毒/抗原）潜伏的毒素，通过经络向外透达。这种方法与牛痘法相同，如果能够推广施行，也是保护婴儿的一种辅助手段。
五、选录各家的精辟论述，当以许橡村为首屈一指。其余各家也各有深奥义理，读者必须细心领会，不可轻视看过。
六、论治方面虽无遗漏，但在疑似、同异之间，病情变化多端，临证医生往往恍惚无所适从，因此选取数十个医案，各种治疗方法大致具备。其中详细阐述了治疗疾病的缘由和始末，阅读者心中豁然开朗。遇到偶尔相似的证候，使用这些方法无疑，疗效可以立即期待，从而避免面对复杂病情时的无奈叹息。
七、全书分为四卷。每卷分八篇，分别是：阐述源流、引种预防、预防措施、禁忌事项、辨证分析、论治方法、运气学说、选录医案。每篇末尾附有我的一得之见。高明之士若能起来纠正，弥补我的不足，固然是我的荣幸，也是这本书的幸运。
八、古人的文章原本连贯，不便割裂。前后之间，难免显得杂乱。书虽分为八篇，但气脉则一贯相通，读者可以参考对照、互相印证即可。
九、本书首要在于畅达阐明医理，不敢因文辞损害义理，对于重复芜杂的指责，我知道在所难免，请读者谅解。
1. The compilation of this book focuses exclusively on *shazhen* (Shazhen, a disease characterized by red maculopapular eruptions on the skin). It does not cover other conditions such as smallpox (*dou*), generalized macules (*ban*), measles (*ma*), or hidden rashes (*yin*). Only *lanhoudansha* (Lanhou Dansha, an acute infectious disease characterized by severe sore throat with ulceration and diffuse scarlet-like rash) is briefly elucidated, though still in a cursory manner. For a comprehensive understanding, one may refer to Chen Gengdao's *Yisha Cao* (Treatise on Epidemic Sha), hence no further elaboration is provided here.
2. In treating diseases, it is essential to understand the meridians. Without clarity on the meridians, one is like a blind person walking at night. Among all meridians, the Sanjiao Meridian (Triple Burner Meridian) is particularly crucial for the latent pathogenic qi (*fuqi*) associated with Shazhen. Since Bian Que (courtesy name Yuere), debates have arisen regarding whether the Sanjiao has a physical form or is formless. Not fearing triviality or impropriety, I have drawn upon Western anatomical texts to clarify these distinctions systematically, illuminating principles that had been obscure for millennia. This serves as a lamp in the long night, preventing groping in the dark.
3. Although the meridians are now clear, the acupoints remain difficult to verify. After the Han and Tang dynasties, acupuncture techniques were lost, primarily due to the failure to distinguish the concept of "tongshen cun" (Tongshen Cun, a proportional measurement method based on the patient's own body dimensions). This led to divergent opinions and communication barriers. By synthesizing various schools of thought, I have expounded upon the essence of the meridians, revealing secrets lost for over a thousand years. This work serves as a bridge for treating douzhen (Douzhen, a general term for variola and related eruptive diseases) and as a valuable vessel for learning acupuncture.
4. Qinglengyuan (TE10, Clear Cold Abyss) and Xiaoluo (TE11, Eliminating Turbidity) are acupoints belonging to the Sanjiao Meridian. The Western practice of inoculation (referring to vaccination, specifically variolation or cowpox inoculation) involves guiding the latent toxin from the Mingmen (Mingmen, Gate of Life, referring here to the source of pathogenic antigens/toxins) outward through the meridians. This method is analogous to the use of cowpox. If widely promoted and practiced, it can serve as an auxiliary means for infant protection.
5. Among the selected excerpts from various authors' profound discussions, Xu Xiangcun stands out as preeminent. Other authors also possess deep insights; readers must carefully comprehend them and not overlook them lightly.
6. Although the discussion on treatment is comprehensive, the similarity and differences between cases, along with the myriad variations in clinical presentations, often leave practitioners bewildered. Therefore, dozens of medical cases are selected, covering various therapeutic methods. These cases detail the etiology and progression of diseases, providing readers with sudden clarity. When encountering similar clinical presentations, applying these methods will yield reliable results without doubt, thereby avoiding feelings of helplessness when facing complex conditions.
7. The book is divided into four volumes, each containing eight chapters: "Elucidating Origins," "Inoculation," "Prevention," "Contraindications," "Syndrome Differentiation," "Treatment Discussion," "Physiognomy and Climate (Yunqi)," and "Selected Cases." At the end of each chapter, I append my humble insights. May scholars correct any errors and fill in gaps; this would be both my fortune and the book's good fortune.
8. Ancient texts should not be arbitrarily fragmented. There may inevitably be some redundancy between sections. Although the book consists of eight chapters, the underlying Qi (vital energy/principle) remains continuous. Readers are advised to consult and cross-reference them.
9. The primary goal of this book is to clearly elucidate medical principles. I dare not let literary style obscure meaning. I am aware that criticisms of repetition and verbosity are inevitable; I ask for the readers' understanding.