A 68-year-old woman presents with tense, fluid-filled blisters on the flexural surfaces of the forearms and inner thighs for 3 weeks. Histopathology shows subepidermal blister with eosinophil-rich infiltrate. Immunofluorescence reveals linear IgG and C3 deposits along the basement membrane zone. Which of the following is NOT a characteristic feature of bullous pemphigoid?

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