Isolated nerve abscess is an uncommon manifestation of infection, caused by Mycobacterium leprae. We report a case of neuritic leprosy which presented as ulnar nerve abscess, posing a diagnostic confusion. Patient presented with a non-inflammatory ovoid swelling accompanied by sensory and motor deficit on medial aspect of middle third of arm. Swelling was found to be attached to ulnar nerve and was excised. Biopsy and special staining for leprosy was positive. Since Leprosy remains a potentially curable disease, an awareness of its atypical manifestations is essential.