Erythema behind the ear is a very common disease in our daily life, so how to prevent this disease? Please see the following introduction. Most of the affected children only need to pay attention to rest, eat easily digestible food, drink more water, and take oral antipyretics if they have fever. Erythema behind the ear is one of the clinical manifestations of infectious erythema. This disease is a mild febrile infectious disease caused by a small virus infection, mostly seen in children under 12 years old. It is prevalent in spring. Most children need to rest, eat easily digestible food, drink more water, and take oral antipyretics if they have fever. A vaccine has been developed for animal testing and is expected to be used for prevention in the future.