Lucio phenomenon and Lucio leprosy.

Lucio phenomenon is a peculiar reactional state associated with Lucio leprosy; both exhibit a restricted global distribution. The exact underlying pathomechanism of Lucio phenomenon, which may be fatal at times, still needs further elaboration. A case of relapse of partially treated nodular lepromatous leprosy presenting with Lucio phenomenon is reported, along with a brief review of the literature.