56-year-old woman with swollen, plaque covered leg

The patient is an obese 56-year-old woman who presents with unilateral leg swelling. The area has been weeping for days.

On examination, you discover a large erythematous, scaly plaque on the right ankle and lower leg. The patient shares with you that five days earlier she was diagnosed by her primary physician with cellulitis and started on “an antibiotic.” There are no other remarkable findings, and she has no fever. View the photo and consider what your diagnosis and next steps would be