What’s Causing This Cancer Patient’s Painful Rash?

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

A. Drug-induced vasculitis
B. Sweet syndrome
C. Erythema multiforme
D. Cellulitis

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