This is a 4-year-old female with a chief complaint of 2 days of rash. She appears to be completely unbothered by the rash, and has been afebrile without any recent infections/illnesses; a complete review of systems is negative. The patient has been eating and drinking well and her behavior is at baseline. Her mother at bedside denies any new exposures such as detergent, lotion, and food. She has no significant past medical history and does not take any medications; she is up to date on vaccines and has not received any new vaccines recently. Vital signs are within normal limits for age. The physical exam is significant for diffusely scattered, erythematous “targetoid” lesions along with equally scattered erythematous, slightly raised wheals. This rash is found on her trunk, extremities, and palms…

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