Is the hip prosthesis responsible for this rash?

A 53-year-old man presented with a 3-week history of a slowly expanding pruritic rash over the right hip. The patient underwent right total hip arthroplasty 10 months prior, complicated by a joint infection requiring 2 incision and drainage procedures and antibiotic bead placement. He was treated with 6 weeks of intravenous rocephin then was transitioned to oral amoxicillin. The area was bandaged for many months. Medical history was significant for tinea pedis with onychomycosis. Physical examination found a 10-cm annular, erythematous patch with fine scaling accentuated at the border (Fig 1). Results of potassium hydroxide preparation are shown (Fig 2).