I agree with Ms. Robinson's description of shingles. It is caused by reactivation of the Varicella Zoster Virus (VZV) which causes chickenpox. When the virus reactivates, it tends to cause a localized inflammatory process that follows a nerve root. That is why the rash seen in typical shingles does not cross the midline of the body and affects a specific dermatome (area of skin supplied by a specific nerve or nerve branch).

Varicella zoster virus is in the herpes virus family, but is different and distinct from herpes simplex virus 1 and 2 which cause cold sores and genital herpes. We treat shingles (typically with antivirals like acyclovir +/- steroids)to prevent the development of post-herpetic neuralgia (PHN), a complication of shingles which can cause persistent pain along the affected nerve, even after the rash from shingles has resolved.

There are vaccinations that are also available to prevent shingles. These vaccinations are recommended for adults age 50 years old or older, people who have medical conditions that keep the immune system from working properly, or people who receive immunosuppressive drugs.

The CDC recommends a single dose of the shingles vaccine for people aged 60 and older, even if they've already had a bout of shingles. There are about 50 million Americans over age 60; more than 95% had chickenpox as children, making millions of older adults vulnerable to shingles.

WebMD has a nice review of shingles, vaccination and complications of shingles. http://www.webmd.com/skin-problems-and-treatments/shingles/default.htm

If you are concerned you or someone you care about may have shingles, you should contact your primary care provider to be examined to determine if you need any treatment or vaccination.