A 6-year-old previously healthy boy presents to an urgent care clinic with the complaint of fever and several tender, erythematous, circular lesions on his skin. The child had been doing well until 2 days ago, when he developed the abrupt onset of subjective fever, frontal headache, nausea, and vomiting. Yesterday, he began complaining of pain over his left elbow. The skin over the elbow became progressively erythematous, with a small papule appearing that increased in size and started to blister. Overnight, the lesion ruptured and the parents noted several similar lesions starting to appear, one on the right shoulder and two others on the left chest. These lesions progressed similarly, all having ruptured by the time of presentation to the clinic.

Review of systems reveals decreased activity and mild fatigue. His appetite has been normal, with good intake of food and liquids. His urine output has not decreased, and his...

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