Hansen Leprosy Tuberculoid Hypopigmented

A 26-year-old schoolteacher from Bihar presents with a six-month history of a slowly enlarging pale patch over the left upper back. She reports complete numbness over the patch and has burned herself multiple times without feeling pain. On examination, the structure marked **A** in the diagram is a single, well-defined hypopigmented lesion measuring 6 × 8 cm with a raised erythematous border, central atrophy, and loss of hair follicles. Slit-skin smears are negative for acid-fast bacilli. Skin biopsy shows well-formed epithelioid granulomas with Langhans giant cells surrounding dermal nerves. Based on these clinical and histological findings, what is the most likely diagnosis?