Unexplained Rash in a 3-Year-Old Girl

A mother brings her 3-year-old daughter to your urgent care center, concerned about a rash that developed at the same time the girl started having a runny nose and low-grade fever, and became slightly lethargic. Now her cheeks are bright red, and she has a blanching macular rash that’s spread slowly from her extremities to her trunk.

View the image and consider your next steps, along with possible diagnoses.