The residual toxicity after the rash is not finished, which means that after the symptoms of measles have basically disappeared, there is still measles heat and toxicity left in the child, which damages the lungs, stomach, yin and fluids, so it is necessary to nourish the yin and benefit the qi, and remove the residual evils for the treatment. The residual poison after measles is mostly seen after the measles rash has appeared, the rash gradually subsides according to the sequence of the rash, and the fever gradually subsides, then there are symptoms such as tiredness and fatigue, the appetite gradually recovers, the mouth is dry but doesn’t like to drink more water, there is a slight cough, hoarseness, and the stools are dry and lumpy, or there is also a low-grade fever phenomenon. The treatment of post-rash residual toxicity needs to nourish the yin and qi, and clear away the remaining evils, and can take Sha Shen Maidong Tang plus subtractions. The residual poison after the rash belongs to a kind of manifestation that the condition of children infected with measles develops smoothly, and most of the poison has been eliminated, but only a part of it is left behind and damages the body. After a child is infected with measles or suspected to be infected with measles, it is necessary to consult a doctor in a timely manner, follow the doctor’s instructions for examination and treatment, and do not leave it unchecked, which will cause the condition to be delayed.