夫发热之时，面色明莹者吉。赤若涂抹者重，此系邪气拂郁于阳明，盖阳明经上循
于面也，宜以清凉解毒之药，少通利之。若面垢惨黯者凶。盖疮疹之火，发自少阳，面
垢者，少阳候见也，治宜表里双解少阳，当从中治也。
夫气色者，脏腑之精华也。凡得本色见于本季而不反者为正，若春季面见青色，观
腮微红，外带微黑者而色光润，是水能生木，出痘必轻，若观腮红而带淡白者，是金
能克木也，出痘必重，甚至七八日死。夏季面见正色观腮微红者，外带黄色兼青色者，
出痘必轻。若黑色外见者，发痘必重，甚至十一二日而死。若纯见青色者，主泄泻而脾
败也。秋季若见颧腮微红而带黄色，兼又唇红眼红，此痘必死。于六七日内，若见纯白
色者，是肺经有风必主疾喘也。冬季若见颧腮微红，外带白色，眼有精神者，此痘必三
四次出，大小不齐，不药自愈。若见颧腮皆红，外带黄色而兼唇白者，痘必尽如蚕种，
在十日十一日而死，然总不拘四时。红黄见于面部者为吉，盖红者，心之有本，黄者脾
之有根，此则气血必盛，而痘出自美，若见青色相兼，且有黑色凝滞不散者，乃肺肝肾
三经反胜，而心脾已失其主矣。再兼坏症，死无疑也。倘得唇齿光泽，眼不见血红，则
但是气不足之故，大加补剂，善于调摄。亦有日至成功之效矣。
在发热期间，如果面色明亮润泽，属于吉兆。如果面色红得像涂抹了颜料一样，病情严重，这是因为邪气郁结在阳明经，因为阳明经上行至面部，适宜使用清凉解毒的药物，并稍加通利之品。如果面色污秽晦暗，属于凶兆。因为疮疹的火毒发自少阳经，面色污秽是少阳经病变的征象，治疗应当表里双解少阳经，关键在于从中焦调理。
所谓气色，是脏腑精华的外在表现。凡是见到本季节对应的正常面色，且不出现相克之色，即为正证。例如春季面色见青色，两腮微红，外带微黑且色泽光润，这是水能生木（肾水生肝木），出痘疹必然轻微；如果两腮红而带淡白色，这是金能克木（肺金克肝木），出痘疹必然严重，甚至导致七八日内死亡。夏季面色见正色（赤色），两腮微红，外带黄色兼青色，出痘疹必然轻微；如果外见黑色，发痘疹必然严重，甚至十一二日内死亡；如果纯见青色，主泄泻且脾脏败坏。秋季如果见颧骨和两腮微红而带黄色，又兼嘴唇红、眼睛红，此痘疹必死；如果在六七日内见纯白色，是肺经有风，必然主疾喘。冬季如果见颧骨和两腮微红，外带白色，眼神有神，此痘疹必然三四次发出，大小不齐，不药自愈；如果见颧骨和两腮皆红，外带黄色兼嘴唇白，痘疹必然全部像蚕种一样细小密集，在十日十一日死亡。然而总归不拘泥于四季。红色和黄色见于面部为吉兆，因为红色代表心气有本源，黄色代表脾气有根基，这样气血必然旺盛，痘疹自然美观；如果见青色相兼，且有黑色凝滞不散，这是肺、肝、肾三经反胜，而心、脾已失去主宰，再兼有坏症，死亡无疑。如果得到唇齿光泽，眼睛不见血红，则只是气不足的缘故，大加补剂，善于调养摄护，也有达到痊愈功效的时候。
During the time of fever, if the facial complexion is bright and lustrous, it is auspicious. If the face is red as if painted, the condition is severe; this is due to pathogenic factors stagnating in the Yangming Channel (Yangming Meridian), as the Yangming Channel ascends to the face. It is appropriate to use cooling and detoxifying herbs, with a slight addition of purgatives or diuretics to promote unblocking. If the face is dirty and dull, it is inauspicious. The fire toxin of sores and rashes originates from the Shaoyang Channel (Shaoyang Meridian); a dirty face indicates signs of Shaoyang involvement. Treatment should involve simultaneous release of the exterior and interior of the Shaoyang Channel, focusing on regulating the Middle Jiao (Middle Burner).
Qi and color are the essence of the Zang-Fu organs. When the proper seasonal color appears without being counteracted, it is considered correct. For instance, in spring, if the face shows blue/green, with slightly red cheeks and slightly black outer areas, yet the color is lustrous, this indicates Water generating Wood (Kidney Water nourishing Liver Wood); smallpox/rashes will be mild. If the cheeks are red but pale white, this indicates Metal overcoming Wood (Lung Metal restricting Liver Wood); smallpox/rashes will be severe, potentially leading to death within seven or eight days. In summer, if the face shows the proper color (red), with slightly red cheeks, and yellow mixed with green on the outside, smallpox/rashes will be mild. If black appears on the outside, the eruption will be severe, potentially leading to death within eleven or twelve days. If only blue/green appears, it indicates diarrhea and Spleen failure. In autumn, if the cheekbones and cheeks are slightly red with yellow, accompanied by red lips and red eyes, the smallpox/rash will be fatal. If pure white appears within six or seven days, it indicates Wind in the Lung Channel, leading to wheezing and asthma. In winter, if the cheekbones and cheeks are slightly red with white on the outside, and the eyes show spirit, the smallpox/rash will erupt two to three times, varying in size, and heal spontaneously without medicine. If the cheekbones and cheeks are entirely red, with yellow on the outside and white lips, the rash will resemble silkworm eggs (small and dense), leading to death on the tenth or eleventh day. However, these rules generally do not strictly adhere to the four seasons. Red and yellow appearing on the face are auspicious because red represents the root of the Heart, and yellow represents the root of the Spleen; thus, Qi and Blood will be abundant, and the rash will emerge beautifully. If blue/green is mixed in, and black stagnates without dispersing, it indicates that the Lung, Liver, and Kidney channels are overacting, while the Heart and Spleen have lost their dominance. Combined with deteriorating symptoms, death is inevitable. If the lips and teeth are lustrous, and the eyes do not show blood-redness, it is merely due to insufficient Qi; with substantial tonifying agents and careful nursing, recovery can be achieved.