A 4-year-old boy is brought to the GP with a 2-day history of fever, sore throat, and a new widespread rash. His parents report that the rash initially appeared on his trunk and has now spread to his arms. He has also been complaining of a “sandpaper-like” sensation on his skin. On examination, he has a temperature of 38.9°C and a fine erythematous rash on his trunk and limbs. There is no wheeze or stridor. His tonsils are enlarged with white exudate, and he has cervical lymphadenopathy.