Pediatric emergency rash, also known as rose rash and roseola, is common in children up to 2 years of age, and mostly occurs in children 6 to 18 months of age. It is often the baby’s first fever, and the vast majority of children will get it basically once before they start kindergarten. Why does pediatric emergency rash occur? Pediatric emergency rash is mainly caused by a baby’s low immune system and human herpes virus type 6 infection. When babies reach 6 months of age, the antibodies they “inherited” from their mothers diminish, but their own immune systems are not developed, so they start to get sick more easily than in the first 6 months. The first disease that comes to the baby is often the emergency rash. HHV-6 (human herpes virus type 6) is thought to be the main, but not the only, cause of the disease, and HIV-7 infection can also cause the disease, which can also cause an acute febrile illness without a rash in infants. The virus can be transmitted through respiratory secretions and saliva, and it usually takes 1 to 2 weeks for children to develop symptoms after infection. It is also possible that a child may already have a roseola, but it is so mild that it goes undetected. Clinical manifestations of pediatric emergency rash 1. Fever Period Often sudden onset of high fever lasting 3 to 5 days. The fever may be accompanied by convulsions, irritability, cough, vomiting, and diarrhea, and some children may have seizures during the fever. Other than this cold symptoms are not obvious, spirit and appetite are still good, but there is mild congestion of the pharynx and tonsils and mild enlargement of superficial lymph nodes in the head and neck. The manifestation of high fever is disproportionate to the mild symptoms and signs. 2. Rash phase The body temperature suddenly decreases to normal on day 3 to 5 of the course of the disease, and a rash appears at the same time or a little later. The rash is scattered and is a rose-red macular rash or maculopapular rash that fades when pressed and rarely fuses. The rash first appears on the trunk and then rapidly spreads to the neck, upper extremities, face and lower extremities. The rash lasts 24 to 48 hours and fades quickly, without pigmentation or peeling of the skin. The diagnosis is difficult during the febrile phase, although it should be considered from the mild systemic symptoms of the child that are inconsistent with the manifestation of hyperthermia and the decrease in the total number of cells in the peripheral blood picture. The diagnosis is not difficult to establish once the fever subsides abruptly with the appearance of a rash. Within 3 days of the onset of symptoms, HHV-6 can be isolated from peripheral blood lymphocytes and saliva, or the viral gene can be detected by nucleic acid hybridization for pathogenic diagnosis. What should I do if I have E.R.? For the majority of children, ESE is a disease that heals on its own and requires only symptomatic treatment without the need to treat the child’s rash. However, since the rash appears after the fever has subsided, we still need to do these things before the diagnosis is confirmed: Temperature control: physical cooling for babies with fever below 38.5°C; fever above 38.5°C with antipyretics such as ibuprofen and acetaminophen. Different antipyretics, with different concentrations, must be careful to follow the correct dosage for your baby. Ensure fluid resupply: Parents should ensure their baby’s fluid intake. Milk, water, soup and porridge, diluted fruit juice, etc. are all liquids. Adequate rest: Toddler rash is usually the first time a baby experiences fever, which is a new and uncomfortable experience for him or herself, so parents should give their babies adequate reassurance. Although toddler rash does not require special treatment, parents need to stay alert during the process of fever and rash and pay attention to whether their baby has some abnormalities, such as poor spirit, vomiting and inability to eat; convulsions; violent cough; and obvious crying when urinating. Special attention should be paid to the fact that if a rash appears during the fever, or before the fever, it is usually not a toddler emergency rash. All of these cases should be promptly referred to the doctor.