Erysipelas, also known as infantile roseola, is a common acute pediatric infectious disease caused by a virus, and the infecting agent is human herpesvirus type VI. The disease occurs mostly in children aged 6-18 months, and is less common after the age of 3 years, with a higher incidence in spring and autumn, and no significant gender differences. The basis for determining whether or not it is an emergency rash in young children is as follows: 1. Symptoms: a sudden high fever in young children, with a rapid rise in body temperature to 39°C-40°C and a persistent fever for 3-4 days. The early stage of high fever may be accompanied by convulsions, slight runny nose, puffy eyelids, etc., while poor appetite, nausea, vomiting and other symptoms may occur during the fever. After the fever subsides, a light red rash or maculopapular rash of different sizes appears, which fades when pressed, initially on the trunk, then spreading to the whole body, with more occurring on the waist and buttocks. And physical examination may find that the child has enlarged lymph nodes behind the ear, behind the occiput and in the neck, and lumps of soybean to peanut meter-like size can be palpated. Generally, through the above symptoms and examination, it can be diagnosed as early childhood emergency rash. Once the disease is diagnosed, treatment with ribavirin granules and vitamin C should be taken reasonably. During the treatment period, children should be given more water, do not let them scratch the skin to avoid skin infection, and go to the hospital for regular follow-up.