Leprosy reactions are acute inflammatory episodes that occur in the setting of Mycobacterium leprae infection. Precipitants of reactions can be pharmacologic and nonpharmacologic. Both type 1 and type 2 reactions typically occur before and during leprosy treatment but may also occur after treatment has been completed. Reactions cause morbidity due to nerve damage, and prompt corticosteroid therapy is warranted to minimize nerve damage due to reactions.
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