The red rash on the child’s body may be the existence of toddler emergency rash, may also be prickly heat, eczema and other factors, need to be analyzed according to the symptoms. 1. Emergency rash: usually caused by herpes virus infection, can be acute, will lead to the appearance of red rash on the body of young children, accompanied by fever, vomiting, diarrhea, fatigue and other symptoms. 2. Prickly heat: mainly related to environmental factors, such as the child in a hot environment, sweating more, will lead to red pimples on the body, accompanied by itching, burning sensation and other symptoms. 3. Eczema: may be related to external stimuli, can lead to young children on the body of small pimples, serious blisters, fusion into a piece, accompanied by redness, itching, vesicles, skin thickening and other symptoms. There may be other reasons for the red rash on the child’s body, and it is recommended that parents take their children to the doctor as soon as possible for examination and treatment to avoid delaying the condition.