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When examining the pulse in measles, from the initial fever and appearance of the rash to its resolution, if the pulse at the Cun position (the first finger position) on the right hand is surging (Hong) and forceful, even if accompanied by other miscellaneous symptoms, there will be no major harm. This is because the right-hand Cun pulse corresponds to the Taiyin Lung meridian. The Lung governs the skin and hair; when the pulse Qi is unobstructed, it naturally carries the pathogenic toxins outward, thus causing no harm. If the Lung pulse appears deep (Chen), small (Xiao), and weak, this is highly inappropriate. Measles erupts in the Yang meridians, yet the pulse is instead deep and small, which constitutes a "Yang syndrome with Yin pulse." Physicians must pay utmost attention here and must not assume that measles cases lack deficiency-cold patterns, nor should they rigidly adhere to clearing heat and detoxifying methods, thereby ruining the treatment outcome.

"Zheng" (symptom/presentation) is equivalent to "Zheng" (syndrome). Observing the external manifestations allows one to understand the internal pathology. This applies to all diseases, not just measles. Measles originates from the Spleen and Lung meridians. Initially, it is triggered by external pathogenic invasion, similar to wind-cold or cold damage, but distinguished by symptoms such as coughing, sneezing, facial swelling, reddened cheeks, swollen eyelids, watery eyes, clear nasal discharge, yawning with lethargy, alternating chills and fever, slightly cold extremities or specifically only the middle finger being cold, palpitations during sleep, nausea, vomiting, or scratching the face, lips, and nose. These are all prodromal signs of measles. Furthermore, after five to six days of fever, red spots appear all over the body. Those large are like pericarpium Sinapis albae (white mustard seed), those medium-sized are like semen Sinapis albae (white mustard seed), and those small are like bombyx batryticatus (silkworm feces); forming granular patches characterizes true measles. "Ma" (measles/rubella-like) is the finest and fragmented, resembling blurred mosquito bites. "Ban" (macules/scarlet fever-like) has no granules, appearing only as continuous red-purple patches, like clouds or brocade. There are also cases where the whole body is merely red without any spots, called Huodan (fire erysipelas); these several types all belong to the category of rashes. Generally, true measles erupts after five to six days of fever, forming clusters or granules, unlike Ban-rash which presents as continuous red skin patches. Moreover, the eruption of Ban-rash is not confined to the third, fourth, fifth, or sixth day; it may emerge and disappear repeatedly, colloquially described as "three eruptions in one day, nine in three days." As long as the eruption is thorough, with a rosy-red complexion all over the body, it is considered auspicious. The most ominous signs are black depression, dense eruptions on the face, eyes, chest, and abdomen, and constriction around the throat, which are termed adverse conditions. If the rash fails to erupt and is accompanied by asthma/dyspnea, death ensues immediately. Similarly, in cold damage with macules, failure to erupt thoroughly is critical. *Yizong Jinjian* states that Ma is the true rash, representing fetal toxicity. Therefore, in all measles cases, one must identify the manifestations associated with each meridian. For instance, if pathogenic qi stagnates in the Spleen, diarrhea persists; if it disturbs the Heart, irritability and fever persist leading to convulsions; if it scorches the Lungs, vomiting, coughing, and hemoptysis occur; if heat shifts to the Liver, excessive eye discharge and tearing result; if it resolves in the Kidneys, gum rot and gan-erosion develop. Once the Five Zang organs are deeply affected, the healthy Qi declines daily and fails to revive. Without early intervention, few cases succeed. There are also incurable syndromes: if the color is dark-black and scorched-dry, disappearing immediately upon eruption, this indicates exhaustion of both Qi and Blood. Nasal flaring and open-mouth breathing indicate impending exhaustion of Spleen and Lung Qi. Blue nostrils and black stool indicate critical failure of Spleen and Kidney. Asthma with precordial suction indicates depletion of Heart Qi. The proverb says, "Watch measles and smallpox as fast as a running horse," emphasizing their rapid changes, unlike ordinary internal injury or external invasion, which allow for slow treatment to achieve results.