A certain condition, thought to be a hypersensitivity reaction, is characterized by skin and mucous membrane lesions. The skin lesions are referred to as target, iris, or bull's eye lesions. The lip and mucosal lesions are more extensive and painful and often appear bloody and crusted. The intraoral lesions are extensive superficial ulcerations. The onset is explosive. On the basis of these clinical features, you suspect:

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The target or iris lesions and the extensive superficial ulcerations on the mucous membranes are classic signs of erythema multiforme. The condition is thought to be a hypersensitivity reaction to various triggers such as viral infections, medication reactions, or autoimmune diseases.

A Certain Condition, Thought to Be a Hypersensitivity Reaction, Is