A 39-year-old white man presented with swelling and pain in both ankles and feet for the past 3 weeks. He also had a nonpruritic rash over his shins and ankles. The skin was tender to the touch. He reported no fever or chills, no symptoms of upper respiratory tract infection symptoms, no cough, and no diarrhea or constipation. His medical history was significant for obstructive sleep apnea and sick sinus syndrome. What is the diagnosis?