A 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, what condition is suspected?

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Erythema multiforme is a hypersensitivity reaction that affects the skin and mucous membranes. Bloody crusted lips are a common presentation. The onset is explosive, and the skin lesions are referred to as target, iris, or bull's eye lesions. Fixed drug eruptions are lesions that appear in the same site each time a drug is introduced. There may be a single red patch or macule on the skin. Mucous membranes are rarely involved. Behçet syndrome is a chronic recurrent autoimmune disease consisting primarily of oral ulcers, genital ulcers, and ocular inflammation. Angioedema appears as a diffuse swelling of tissue caused by permeability of deeper blood vessels.

A Condition Thought to Be a Hypersensitivity Reaction Is Characterized