Dermatology — Melanoma ABCDE

A 52-year-old man with fair skin and a history of multiple sunburns in childhood presents with a pigmented lesion on his trunk. On examination, the lesion marked **A** in the diagram shows asymmetry, irregular borders with notching, variation in color (brown, black, and red), a diameter of 8 mm, and the patient reports it has been slowly enlarging over the past 6 months. Full-thickness excisional biopsy reveals a lesion with a Breslow depth of 2.5 mm and no ulceration. Which of the following is the most appropriate next step in management?