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Dou (Smallpox/Chickenpox), meaning "bean," is named for its shape resembling a bean. Beans are the grain associated with the Kidney, and the root cause of Dou also originates from the Kidney; the principle is the same. The formation of a fetus in humans results from the union of the father's essence and the mother's blood. This "Yin Fire" (referring to the physiological fire or pathological deficiency fire involved in conception) serves as the root cause of Dou and resides within the Kidney. When the human form takes shape, the two Kidneys appear first, analogous to the two cotyledons of a melon or fruit seed. When Dou erupts, it follows specific meridians (Meridians). Eruption via these meridians constitutes a favorable condition (Shun), while eruption outside them constitutes an unfavorable condition (Ni). What are these meridians? They refer to the Pericardium Luo (Collaterals of the Pericardium). The collaterals of the Pericardium govern blood and vessels, circulating throughout the body. The pathogenic toxin moves from the Yin aspect to the Yang aspect, ascending from below, impacting the Pericardium, entering the meridians from the Pericardium, and finally emerging onto the skin from the meridians. Because it impacts the Pericardium, convulsions and fright (Jing Chu) must occur first; because it emerges from the meridants onto the skin, the eruptions appear gradually rather than suddenly; because it travels from the Pericardium into the meridians, it transforms blood into pus (Jiang). In such cases, even if the eruptions are dense, recovery will be achieved. If it does not emerge via the Pericardium's meridians but instead follows the Qi of the Sanjiao (Triple Burner) to travel through the muscle-couli (Muscle Intercellular Spaces), emerging from the couli onto the skin, this is an unfavorable and dangerous condition. The Pericardium governs the vessels, and vessels constitute Yin Blood; the Sanjiao governs Qi, and Qi constitutes Yang Qi. Emerging via the Pericardium's blood vessels allows for a gradual emergence, transforming blood into pus, which characterizes a favorable syndrome. Emerging via the Qi aspect of the Sanjiao results in no gradual process, inability to transform blood into pus, leading inevitably to swollen flesh but non-swollen eruptions, where Qi arrives but Blood does not follow, the roots do not contract, and boundaries are indistinct. The eruptions may become flat and wide like an empty granary, fragmented and mixed with purple brilliance, or grayish-white due to Yin Cold; these are all unfavorable conditions. Generally, when the toxin travels through the meridians, the Sanjiao harmonizes, enabling the stomach's external digestive function (Ran Gu), allowing natural appetite; if the toxin travels through the Sanjiao, the Sanjiao becomes diseased, failing to support the stomach's digestive function, resulting in loss of appetite. Therefore, the favorable or unfavorable nature of Dou eruption follows a fixed pathway. Physicians should observe calmly and must not administer medication recklessly. If medication is used, it should drain Kidney toxins and unblock the meridians. If the toxin is abundant, it should be purged first; if not abundant, it should be guided and directed to emerge via the meridians. This is the method of treatment. Ignoring this and prescribing blindly, falling into the clichés of medical texts by using heavy purgatives or heavy cooling agents, is not treatment but harm. These words I speak represent immutable truths, nothing extraordinary. Physicians who do not understand the pathways of meridians, Qi, and Blood, nor the principles of Yin-Yang intersection, will diagnose: if there is fright and palpitations, it is Heart Meridian Dou; if coughing, Lung Meridian Dou; if flat and wide, Spleen Meridian Dou; if red, round, and blooming, Liver Meridian Dou; if gray-purple and depressed, Kidney Meridian Dou. Consequently, they use attacking and releasing methods that weaken the muscular exterior and use cold-cooling methods that disrupt the meridians. It is common to see that children with dense yet favorable Dou, when treated by pediatric specialists, suffer worsening conditions; worsening leads to danger, and danger leads to death. It has never been heard that children with unfavorable Dou can recover when treated by pediatric specialists. Observing rural valleys where medicine is scarce, many with Dou survive; whereas in provincial capitals where medicine is most abundant, the majority of those with Dou die. Is this not clear evidence that treatment leads to death!