The difference between viral rash and toddler’s emergency rash is mainly in terms of etiology, systemic symptoms, rash characteristics and with fever. The toddler’s rash is a kind of viral rash. Viral rash refers to the rash caused by viral infection, common measles, rubella and infantile emergency rash. 1. Pathogen: The pathogen of toddler rash is human herpes virus type 6. In addition to human herpes virus type 6, measles virus, rubella virus and other viruses are also responsible for viral rashes. 2. Systemic Symptoms: Childhood emergency rash is common in infants and young children, high fever with convulsions, swollen lymph nodes behind the ears or mild diarrhea, high fever for 3 to 5 days after the body temperature drops to normal. Viral rash according to the different types of infected virus symptoms are different, such as measles symptoms of fever, cough, photophobia, conjunctivitis, etc.; rubella symptoms are mild, swollen lymph nodes behind the ear, occipital tenderness. 3. Rash characteristics: toddler rash is red small dense maculopapular rash, mostly in the head, face and trunk, 1 day out Qi, the second day began to subside. Viral rashes such as measles is a red maculopapular rash, can be developed from the head and face to the neck, trunk, limbs, leaving pigmentation and flaking after the rash. Rubella is maculopapular, from the face and neck to the trunk, limbs, skin between the rash can be normal, no pigmentation and flaking after the rash subsides; 4. The relationship between rash and fever: the rash appears after the temperature of infantile rash decreases. Measles fever 3~4 days after the appearance of rash. Rubella usually appears 1~2 days after the appearance of symptoms. The appearance of viral rashes, it is recommended that timely diagnosis and treatment.