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The *Rites of Zhou* records that the methods used by the Duke of Zhou to govern the world were comprehensive in every aspect. Regarding physicians, it was specifically stipulated that they should be appointed from among the "Shangshi" (Upper Scholars, a high-ranking official class indicating deep learning and status). Even for birds and beasts, there were veterinary practitioners. From this, we can know that the skills of the hundred schools of thought were all created and established by sages; they are indispensable for the livelihood of the people for even a single day. Their merit in managing state affairs and assisting in the transformation of nature is truly supreme.

In the current era, physicians also hold official positions, and there are many practitioners in various regions. However, records of famous doctors in historical biographies are rarely heard of. It is not easy to encounter physicians who are upright, thorough, and well-versed. This is likely due to the lack of profound academic study, causing the Dao of medicine to become increasingly obscure. My friend, Mr. Ye Ziyu, was intelligent and fond of learning. In his middle age, he frequently suffered family disasters and was often misdiagnosed and mistreated by incompetent doctors. Consequently, he sighed with determination to save the world. He extensively collected medical texts, closed his door for ten years to study deeply, and explored the mysteries of Huangdi Neijing and Qibo (referring to traditional Chinese medical classics). His writings were abundant. Recently, he showed me his work, *Shazhen Jiyao* (Essentials of Gathering on Scarlatiniform Eruptions), which I read repeatedly. The book analyzes syndrome differentiation and seeks the cause, synthesizing both Chinese and foreign perspectives. It clearly critiques and judges theories from predecessors that were based on insufficient evidence or forced interpretations. Furthermore, it elucidates the meanings of the Sanjiao (Triple Burner: the functional systems of the upper, middle, and lower body cavities) and Tongshen Cun (Same-Body Cun: acupuncture measurement units based on the patient's own body proportions), expounding upon insights previously unmentioned by predecessors. These are particularly profound truths and principles that transcend ancient and modern times. It can indeed be called a book to benefit the world, and a book to be passed down through generations. Therefore, it is printed and made public to the world. This is the preface.

Written by Li Zhenting of Beiting, Siming, at the beginning of late spring in the Gengyin year of the Guangxu reign.

The condition of Shazhen (scarlatiniform eruptions/epidemic exanthems) is not recorded in the classic prescriptions of the Han and Wei dynasties. After the Tang and Song dynasties, no one discussed it either. During the Ming Dynasty, Wan Shi from Luotian slightly clarified its principles, but the explanation was vague and difficult to use as a standard method. In recent times, some experts have provided refined discussions, but these are mostly scattered at the end of books on smallpox. They are often confused with Yin Zhen (hidden rashes) and Shi Ma (seasonal measles), leading to unclear syndrome differentiation and frequent errors in treatment methods, primarily due to the lack of specialized monographs. I felt great pity for this situation. In the winter of the Wuzi year, by lamplight on a cold night, I browsed old texts. Not daring to let my limited knowledge hinder me, I extracted the essence of ancient philosophers and uncovered the profound intentions of former sages, compiling them into a volume. Occasionally adding my own humble insights, I titled it *Shazhen Jiyao*. I dare not claim it has merit to the world, but perhaps it may offer some minor assistance to those practicing this specialty.

Preface by Ye Lin at Shilin Study, Spring of the Gengyin year of the Guangxu reign.