Case of lepromatous leprosy misdiagnosed as systemic sclerosis.

Hansen's disease (HD) is a chronic granulomatous infectious disease caused by Mycobacterium leprae. The worldwide prevalence rate of HD has decreased gradually over the years. The clinical manifestations of HD are extensive, with involvement of the skin and various organs, and these can resemble those of many rheumatic diseases. Our patient initially presented with gradual sclerotic skin change and slight sclerodactyly with Raynaud's phenomenon, which is frequently observed in systemic sclerosis. However, a skin biopsy with acid-fast stain later confirmed lepromatous leprosy. We report this case to emphasize the role of dermatologists for applying a systematic approach to the skin lesions of HD, which has become difficult to detect because of its rapidly declining prevalence rate.