Herpes zoster
Herpes Zoster (Shingles) is caused by the varicella-zoster virus, the same virus that causes chickenpox. You will first notice headaches and may become sensitive to light. This is followed by a rash, often on one side of the face, neck, chest or arm. It can be very troublesome and cause blisters on the skin. Within a week, crusts will form before it begins to heal. For some, the discomfort persists long after other symptoms have subsided.