Review Question - QID 8593

A 49-year-old man is seeking a second opinion for continued knee pain and swelling. He went to his primary doctor for swelling "on top of his knee," and he says his doctor drained some clear fluid. He noted that his condition improved for about 1 week before the swelling returned. He now has increasing pain and redness around his kneecap. Examination reveals significant swelling of his prepatellar bursa, with erythema over the bursa that extends to the surrounding skin. His temperature in the office is 101.7°F. What is the next step in treatment for this patient?