Eroded vesicles on a boy's face and neck

A 16-year-old Hispanic male with a history of well-controlled moderate-to-severe atopic dermatitis presents to the emergency room complaining of a one-day history of a painful facial rash. He reports that the initial lesion started on the cheek and quickly spread from there. He has been applying triamcinolone ointment twice daily to the lesions, but the lesions have continued to spread. ...