Q. A 40-year-old hiker presents with a painful, erythematous lesion on the lower right leg, which she noticed a day after a hiking trip. She recalls seeing a small, brown spider in the area but did not feel the bite at the time. Over the past 24 hours, the lesion has become more painful and developed a bluish discoloration at the center. On examination, there is a 2 cm erythematous lesion with central cyanosis and mild edema on the lower right leg. The lesion is tender to touch, and there is no pus or signs of secondary infection. The patient's vital signs are stable. What is the most appropriate initial management for this patient?