A 24 year old female patient with normal vital signs present…

A 24 year old female patient with normal vital signs presents with lesions on her lip that erupted after she endured a tingling and burning sensation in the same area.  All other areas of her skin are normal. She says no one else in her family has this symptom. The patient is very worried  about them  clearing up before her wedding in two weeks. The lesions appear as vesicles surrounded by an erythematous base.  Your top differential diagnosis is most likely: