A 62-year-old farmer from rural Rajasthan presents with a 2 cm erythematous, scaly nodule on the dorsum of his left hand with central ulceration and raised rolled edges. He reports a 6-month history of progressive growth. Dermoscopy shows hyperkeratosis and abnormal vasculature. Biopsy confirms well-differentiated squamous cell carcinoma (SCC) with no perineural invasion. The lesion is clinically confined to the skin without regional lymph node involvement. What is the most appropriate next step in management?