This sounds like an illness called 'slapped cheek syndrome' or Fifth disease. It is a viral illness caused by the Parvovirus B19. It is usually a very mild illness and children may not even appear ill or have a fever. The main feature of the illness is the red cheeks and often red ears as well. There is no specific tretament but it may take as long as 2 weeks for your son's red cheeks to clear up.
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