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The resolution of measles is considered normal if it takes three days, proceeding neither too fast nor too slow, thereby avoiding sequelae. If the rash disappears in less than three days and no trace remains on warm areas of the skin, this indicates an excessively rapid disappearance. This is likely due to improper care, invasion by wind-cold, or contact with pathogenic filth, causing the toxin to retreat inward. Urgent internal administration of Jingfang Jiedu Tang (Jingfang Detoxification Decoction) is required, along with external fumigation of clothing and bedding with Huqi Wine (Coriander Wine), to force the rash to re-emerge, ensuring safety. In cases where two to three days have passed and although the rash has seemingly disappeared, traces remain on warm skin areas, it indicates that the toxin is not yet fully expelled. Failure to treat properly will lead to inward attack; therefore, one should still employ methods to vent and support the exterior, assisted by cooling agents. If the rash fails to disperse when it should, it is due to deficient heat lingering at the surface. One must absolutely avoid using purely cold-natured medicines; instead, Chaihu Siwu Tang (Bupleurum Four Substances Decoction) should be used to harmonize the blood level. Once residual heat is completely cleared, the rash will resolve. If the measles spots appear white and are hidden beneath the skin, appearing as if resolved but not truly so, it is caused by wind-cold obstructing the exterior, preventing eruption, which is also a sign of exterior deficiency. It is appropriate to use warming dispersants to transform the white color into vibrant red, preventing complications. As the ancients said: "White rashes resolve naturally through warming." If the rash persists for five to six days without resolving, it is because internal heat remains, preventing complete resolution; cooling herbs combined with diuretics should be used. If accompanied by irritability and a surging, rapid, and forceful pulse at the right Guan position, damp-heat is latent in the stomach; Huaban Tang (Hua Ban Decoction) is indicated. If the body remains feverish after the rash has vanished, with no relief day or night, evil fire is stagnant between the skin and muscles. Over time, hair becomes brittle and dry, the skin dries out, and muscles waste away, constituting Gu Zheng Lao Syndrome (Bone-steaming Consumption Disease); Lushui Fei'er Wan (Lushui Fatten-the-Child Pill) should be administered, as delay renders it incurable. If, after the rash vanishes, the body does not emaciate but experiences periodic high fever, irritability, convulsions, palpitations, delirium, and mental confusion, this indicates depletion of Yin-blood, with residual toxins entering the Liver and transmitting to the Heart; Zaomai Siwu Tang (Jujube and Wheat Four Substances Decoction) is the primary treatment.

In one scenario, continuous low-grade fever persists after rash resolution. Failure to treat early leads to Gan Syndrome (Infantile Malnutrition), inevitably causing abdominal distension, afternoon fever, and headache; Chaoling Siwu Tang (Bupleurum and Pinellia Four Substances Decoction) is indicated. For thirst, poor appetite, and vexation, Xiaochaihu Tang (Minor Bupleurum Decoction) is suitable.

In another scenario, tidal fever occurs after resolution; Shengma Gegen Tang (Cimicifuga and Pueraria Decoction) is indicated. For vexation and thirst, Huanglian Jiedu Tang (Coptis Detoxification Decoction) is used. For dark urine resembling rice-washing water, Wuling San (Five-Ingredient Powder with Poria) plus Cheqianzi (Plantago Seed) and Mutong (Akebia Stem) are prescribed. If hematochezia appears, Huanglian Jiedu Tang combined with Xijiao Dihuang Tang (Rhinoceros Horn and Rehmannia Decoction) is indicated. For epistaxis, Liangge San (Cool the Upper Jiao Powder) plus Zhiren (Gardenia Kernel), Shengdi (Rehmannia Root), and Tongbian (Child's Urine) is used.

In another scenario, evening irritability, delirium, and mania indicate residual heat in the Lung and Stomach; Chen Sha Yiyuan San (Cinnabar Yi Yuan Powder) decocted with Dengcao (Juncus Effusus Stem) is taken orally, or Chen Sha Wuling San (Cinnabar Five-Ingredient Powder with Poria) decocted in water.

In another scenario, diet and activity remain normal post-resolution, but sudden severe heart and abdominal pain occur with profuse sweating like water. This indicates Qi-Yuan deficiency due to lack of regulation and tonification, compounded by accidental exposure to malignant qi, termed Zhong E (Sudden Collapse from Evil Qi). The patient is critically ill. Administer 2 qian of Shenren powder (Amomum Fruit Powder) mixed with Fu Mai decoction (Floating Wheat Decoction), or drink warm water infused with Fulonggan (Dragon's House Earth). This saves one in a hundred cases.

In another scenario, abdominal pain with diarrhea post-resolution requires Lianshao Tang (Coptis and Peony Decoction). If abdominal distension and anorexia occur due to Spleen-Stomach injury, Chaisu Qingfei Yin (Bupleurum and Perilla Lung-Clearing Decoction) is indicated.

Facial and ocular edema results from dietary injury or excessive consumption of raw/cold foods, leading to failure of Yin-Yang ascent/descent and stagnation of Bladder Qi. If oliguria occurs, asthma may follow; Wuling San plus Mutong, Huashi (Talcum), and Fupi (Mandarin Orange Peel) is prescribed. If wheezing occurs, Siling San (Four-Ingredient Powder with Poria) plus Zhuli (Bamboo Sap), Sangpi (Mulberry Bark), and Tingli (Periploca Seed) is used. Severe acute wheezing is incurable.

Diarrhea post-resolution is treated with Huanglian Jiedu Tang combined with Daochi San (Guide Out Redness Powder). If diarrhea is unceasing, accompanied by thirst, closed eyes, and cold limbs, the prognosis is poor. If vomiting and anorexia are added, with prolapsed anus or a rectum straight as a bamboo tube, it is incurable. Dysentery post-resolution indicates heat accumulation in the Large Intestine; Siling San plus Huangqin (Scutellaria Root), Huanglian (Coptis Rhizome), Mutong, and Baishao (White Peony Root) is used, or Xianglian Wan (Fragrant Coptis Pill) is acceptable.

Cough post-resolution is treated with Liangge San plus Jiegeng (Platycodon Root) and Digupi (Groundsel Root). If cough persists, Qingfei Yin (Lung-Clearing Decoction) or Siwu Tang combined with Erchen Tang (Two-Aged Decoction) plus Jiegeng, Gualou (Trichosanthes Fruit), and Wuwei (Schisandra Berry) is used. Add Maidong (Ophiopogon Tuber) for thirst. Add Sangpi, Zhike (Aurantii Fructus), and Suzi (Perilla Fruit) for wheezing. Irritative cough or hemoptysis indicates heat-toxin attacking the Lung; Maidong Qingfei Yin (Ophiopogon Lung-Clearing Decoction) is indicated.

A chest protruding like a tortoise shell, shoulder shrugging during breathing, bleeding from mouth/nose, head shaking, hand waving, and waxing/waning sallow complexion are signs of incurability. However, if asthma persists due to Lung-Qi deficiency obstructed by toxin, Qingfei Yin with doubled Renshen (Ginseng Root) is used; do not rigidly adhere to the concept of Lung-Heat and use only cooling agents. Hoarseness, asthma, cough, and persistent fever indicate Lung-Metal being overcome; Qingjin Jianghuo Tang (Clear Metal and Descend Fire Decoction) is indicated. Internal attack of measles toxin causing wheezing, chest protrusion, abdominal tension, and closed eyes is a nine-deaths-one-life condition; Fangfeng Xiaodu Yin (Saposhnikovia Detoxification Decoction) must be used immediately.

Abscesses and joint pain post-resolution indicate retained heat-toxin; Qianghuo San (Notopterygium Powder) is used to induce slight sweating and promote urination. Generalized sores termed Ma Feng Chuang (Measle Wind Sores) require Da Lianqiao Yin (Large Forsythia Decoction). If sores persist with fever, exterior-release with Shufeng San (Wind-Dispersing Powder) is needed; otherwise, they will recur annually.

Red eyes and swelling with corneal opacity post-resolution indicate measles toxin attacking upward, eventually damaging vision; Xionggui Yin (Angelica and Ligusticum Decoction) is indicated.

Painful swelling of ulcers on the tongue and mouth indicates Heat in the Heart and Spleen, inevitably causing constipation and difficult urination. Clear Heart-Spleen Heat and moisten the Large Intestine using Zhuling Zexie Tang (Polyporus and Alisma Decoction) to drain residual toxin; symptoms will resolve spontaneously. Severe yellow-red-white ulceration of lips and tongue requires urgent clearing of Stomach Heat and cooling Blood, assisted by intestinal moistening.

Yagen (Gum Rot) post-resolution indicates toxin-fire attacking the Heart and Spleen meridians. Delayed treatment leads to cheek perforation and tooth loss, even phlegm-asthma, rendering rescue impossible. Post-measles blood depletion, early consumption of sweets, and wind-induced worm erosion of bones/tissues cause oral/nasal necrosis. Wash thoroughly with rice-water, then apply Shengjin San (Shengjin Powder) urgently, or Ya San (Tooth Powder). Continue with Xiaodu Yin combined with Siwu Tang plus Gancao (Licorice Root) and Wuwei Zi (Schisandra Berry) for better effect. For throat rot, insufflate medicine via a small bamboo tube. Red spots on the Shan Gen (Root of Nose) indicate incurability. Flesh rot from Yagen with rampant epistaxis and hemorrhage are treated with Siwu Tang plus Shanzha (Hawthorn Fruit), Yinchern (Artemisia Capillaris), Mutong, and Xijiao (Rhinoceros Horn - *Note: Use substitutes in modern practice*). White coating on the tongue from Gan syndrome indicates gastric rot, which is incurable. Measle toxin entering the Stomach, knotting and failing to disperse, causes black, rotting, bleeding gums, known as Zouma Yagen (Running Horse Gum Rot). Long-term progression leads to cheek perforation, lip retraction, and nasal collapse, becoming critical. Externally, Wen Ge San (Clam Shell Powder) or Xionghuang San (Realgar Powder) applied after washing with Mugwort decoction is used, followed internally by Lushui Huanglian Wan (Lushui Coptis Pill) to clear Stomach Fire. Generally, for initial redness and swelling of Yagen, Qingwei San (Clear Stomach Powder) is the primary treatment.