A 32-year-old male farmer from rural Maharashtra presents with a single hypopigmented macule on his left forearm with loss of sensation over the lesion. On examination, the lesion measures 4 cm × 3 cm with well-defined borders and no visible nerve thickening. Slit-skin smear is negative for acid-fast bacilli. Based on the National Leprosy Eradication Programme (NLEP) classification, what is the most appropriate diagnosis and initial management?