A 7-year-old boy is brought to your urgent care center by his mother because she’s concerned about a rash of scaly papules on his trunk, some of which had crusted or healed. A few of the lesions are hemorrhagic. She notes that they appeared a few days ago, accompanied by a mild fever. She dismissed the possibility that the source could be chickenpox because her son had been vaccinated. The boy reports that the papules …
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