2) A 30-year-old pregnant woman presented to the emergency department at 34 weeks of gestation with a 5-day history of an itchy rash. The rash had erupted across the abdomen and had spread to the thorax and to the arms and legs. The head, neck, and mucosa of the mouth and nose were not affected. Physical examination revealed confluent papules and blisters on the arm (Panel A) and across the abdomen (Panel B). There was no palpable lymphadenopathy. What is the diagnosis?
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