Bullae and Atypical Target Lesions in a Young Woman

A young woman with a history of systemic lupus erythematosus was readmitted with fever and a generalized eruption; 6 days prior she had been hospitalized for a photo-induced flare of acute cutaneous lupus erythematosus; at readmission, she had a worsening, tender rash with several blisters across her right arm. What is your diagnosis?

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