69-year-old female, presents to primary care physician consult with a complaint of a painful rash on her back. She reports that the rash started about three days ago as a tingling sensation, followed by the appearance of red, blister-like lesions. The rash is localized to the right side of her back and does not cross the midline. She describes the pain as burning and sharp, rating it as 7 out of 10 in intensity. On the physical examination there iis evidence of a Cluster of vesicular lesions on an erythematous base, located on the right side of the back we started on acyclovir x 7 days , analgesics and we will evaluate response next visit