One of the characteristics of infantile emergency rash is the sudden high fever, which can reach 39～40℃ and last for 3～5 days, so children diagnosed with infantile emergency rash will definitely have a high fever. Measles is a rash disease in infants and young children caused by human herpesvirus type 6 or 7 infection. In addition to the sudden high fever, another disease characteristic of Measles is that the fever recedes and the rash appears, i.e., after the high fever recedes, red macular or maculopapular rashes appear on the child’s face and trunk, and come out within one day, and the rash basically disappears within 2 to 3 days. Eczema may cause febrile convulsions and, in severe cases, meningitis and encephalitis. If you suspect that there is a toddler rash, you should go to the hospital in time, under the guidance of the doctor for standardized diagnosis and treatment, so as not to delay the condition.