A 44-year-old woman recently diagnosed with acute myeloid leukemia presents with a 5 day history of fever, malaise, and a painful rash; this appeared approximately 3 weeks after she received chemotherapy. Examination reveals erythematous papules on her back, arms, and the dorsum of both hands. Blood test shows an elevated white blood cell count, and a skin biopsy is performed. What is the most likely diagnosis?
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