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1. The manifestations of the Five Zang organs are all reflected on the face; therefore, by observing the specific areas of the face, one can determine the auspiciousness or inauspiciousness (prognosis) of the condition. Generally speaking, on the human face, the left cheek corresponds to the Liver, the right cheek to the Lung, the forehead to the Heart, the chin to the Kidney, and the nose to the Spleen (Earth element). Furthermore, the eyes are the orifices of the Liver, the nose is the orifice of the Lung, the mouth is the orifice of the Spleen, the ears are the orifices of the Kidney, and the tongue is the sprout (manifestation) of the Heart. If, before the eruption of smallpox or chickenpox, the various parts of the central face appear bright and moist, it is a good omen; if they appear dry and dull, it is a bad omen. Additionally, the Shan Gen (root of the nose) is called the Palace of Life (Ming Gong), and the Nian Shou (middle part of the nasal bridge) is called the Palace of Illness and Disaster (Ji E Gong). If these two palaces exhibit red-yellow brightness, it is a good omen; if they exhibit blue-black darkness, it is a bad omen.

The meridians of the Three Yang (Taiyang, Yangming, Shaoyang) all converge on the face. The center of the forehead is where the Taiyang meridian converges; the lips and chin are where the Yangming meridian resides; and the areas in front of and behind the ears are where the Shaoyang meridian passes. Smallpox/chickenpox toxin is considered Yang toxicity, so it manifests first on the face following the movement of Yang Qi. The Yangming meridian connects to the Stomach and Large Intestine, which are places where old substances accumulate, decay is accepted, and both blood and Qi are abundant. Therefore, when smallpox/chickenpox first erupts, if the lesions appear first only on both sides of the mouth and nose, above and below the Philtrum (Ren Zhong), and between the cheeks, chin, and Nian Shou (areas governed by the Yangming meridian), it is a favorable sign. In contrast, the Taiyang meridian is a place where Water and Fire contend, and the Shaoyang meridian is a region where Wood and Fire combine. If lesions appear first in these respective locations, it is an unfavorable sign. This principle applies equally to the stages of pustule formation and scabbing.

1. Various parts of the body also have their own diagnostic criteria. For instance, the head is the gathering place of all Yang meridians; the lateral cheeks and jaw angles are the repositories of the essence of the Five Zang organs; the pharynx is the pathway for food and drink; the larynx is the gatekeeper for respiration; the chest and abdomen are the sea where Yang Qi receives its nourishment and the residence of the Heart and Lung; the back and spine are the unification of all Yang meridians and the connection point for the Qi of the twelve meridians and Zang organs. If eruptions are sparse in these five areas, it is auspicious. However, if there are many eruptions on the forehead, it is called "Meng Tou" (Covering the Head). If there are many on the neck, it is called "Suo Xiang" (Locking the Neck). If there are many on the chest, it is called "Man Xiong" (Deceiving the Chest). Meng Tou indicates hyperactive Yang toxicity and exhaustion of True Yin. Suo Xiang indicates the cessation of Qi entry and exit, and the extinction of Qi transformation. Man Xiong implies proximity to the Heart and Abdomen, leading to loss of Shen (Spirit) guardianship. If eruptions on the lateral cheeks and jaw angles become dense patches or resemble applied cinnabar, it signifies Liver excess overacting on the Spleen. In such cases, around the eighth or ninth day, symptoms such as slippery diarrhea with green stools or inability to eat often appear, representing critical conditions. Thus, excessive eruptions in these areas are undesirable. Although the four limbs are the roots of Yang, they are served by the body like low-ranking soldiers; therefore, even numerous eruptions there do not cause harm. This holds true for the stages of rising, filling with pus, and scabbing. Furthermore, the Xin Wo (pit of the stomach) and the centers of the hands and feet are collectively called the "Five Hearts." If eruptions are abundant here, the condition must be severe. If eruptions on the head, face, chest, neck, hands, and feet are fine, fragmented, dense, and uniform throughout, it suggests depletion of Qi and Blood, weakness of the Spleen and Stomach, and failure of circulation and infusion throughout the body, leading inevitably to danger.