The first thing to do when a child has a red rash on a fever is to determine the type of illness.
Usually, a rash that appears after 1 day of fever is chicken pox or rubella; a rash that appears after 2 days of fever is scarlet fever; a rash that appears after 3 days of fever is measles; and a rash that appears after 3 to 5 days of fever is toddler’s emergency rash. Rubella is caused by a viral infection and is usually treated mainly with antiviral and symptomatic treatment; scarlet fever is mostly caused by streptococcal infection and is treated mainly with anti-infective treatment; measles is treated mainly with symptomatic treatment. No special treatment is needed for toddler’s emergency rash and general care of the child is sufficient.