Ulcerative type 1 lepra reaction in borderline-tuberculoid leprosy

Introduction: leprosy is a chronic infectious disease caused by Mycobacterium leprae, characterized by a wide spectrum of clinical presentations. In India, borderline-tuberculoid leprosy is the most common form encountered in clinical practice. Type 1 lepra reaction in borderline- uberculoid leprosy usually presents as the development of erythema and/or edema in pre-existing skin lesions. Ulceration of skin lesions in type 1 lepra reaction is uncommon and occurs in severe reactions. Objective: to report an unusual presentation of borderline-tuberculoid leprosy with ulcerative type 1 lepra reaction in an immunocompetent patient. Case description: we present the case of a 65-yearold man with chief complaints of ulcerated plaque over his left thigh. He also had other skin lesions suggestive of borderline-tuberculoid leprosy over his trunk and limbs, as well asenlarged, mildly tender left ulnar and lateral popliteal nerves. A slit skin smear was negative, while a skin biopsy supported the diagnosis of borderline-tuberculoid leprosy. The patient responded to multibacillary multidrug therapy according recommended by World Health Organization and tapering doses of prednisolone, with complete healing of the ulceration at six weeks follow-up. Discussion: type 1 lepra reaction associated with borderline-tuberculoid leprosy usually presents with increased erythema and edema in pre-existing skin lesions. Ulceration in such skin lesions is not commonly seen except in cases with severe type 1 leprosy reactions. Administration of oral corticosteroids along with multibacillary multidrug therapy is the key to managing ulcerative type 1 lepra reaction. The ulceration heals rapidly with tapering doses of oral corticosteroids, limiting the duration of morbidity. Final consideration: the case emphasizes the need for dermatologists and leprologists to be aware of atypical presentations of leprosy reactions, ensuring timely diagnosis and effective management to achieve optimal patient outcomes.