
THE CASE: A 3-year-old boy is brought to the office by his mother. The previous evening, she had noticed a single large red spot on the back of his thigh. This morning, his whole body was covered with a similar rash, and he had a temperature of 38.8°C (102°F). The mother administered 1 dose of acetaminophen at home for the fever; the rash was asymptomatic.

