MSFinals-0770

A 70-year-old man presents with erythema, vesicles and crusted ulcerations on the right scalp, forehead and periorbital region. The affected area is swollen and causing him pain. Additionally, there are some vesicles present at the tip of his nose. He reports experiencing a headache in that area several days prior to the onset of the rash. What is the most probable causative organism for this rash?