Q. A 52-year-old construction worker presents with a three-day history of a rapidly spreading, painful, red rash on the lower left leg. The patient recalls having a small cut on the leg a week ago while working. The patient reports feeling feverish and has a low-grade fever. There is no history of diabetes, peripheral vascular disease, or similar episodes in the past. On examination, the left lower leg is warm, erythematous, and edematous, extending from the ankle to mid-calf. The area is tender to touch, and there is no purulent drainage or point of fluctuance. The patient is hemodynamically stable. What is the most appropriate initial management for this patient?