38-year-old Female with Painful Patches and Plaques

38-year-old Female with Painful Patches and Plaques

A 38-year-old female develops skin lesions on her buttocks, thighs and arms approximately five days after starting a medication.

Her past medical history is significant for atrial fibrillation, diabetes, depression, obesity and migraine headaches. The patient’s medications are warfarin, metformin, paroxetine and naproxen.

What medication is responsible?