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151476 Medicine

A 56-year-old man is evaluated for recent onset painful skin lesion which involves his abdominal wall. The lesion started 3 days ago as a small erythematous macule which has gradually increased in size to a large purpuric lesion with bulla formation. He is afebrile and does not recall any trauma. His medical history is significant for atrial fibrillation; he was recently switched from rivaroxaban to warfarin due to the high cost of rivaroxaban.What is the most probable cause of the condition?

ARivaroxaban
BLow-molecular-weight heparin
CWarfarin
DLow dose aspirin (81 mg/d)
Medicine
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