Shingles (also called herpes zoster) occurs when a person's past chickenpox infection is reactivated.

CNN: Is it possible to get shingles after childbirth a second time?

Postherpetic neuralgia (post-her-PET-ic noo-RAL-jah) is a complication of shingles, which is caused by the chickenpox (herpes zoster) virus.

CNN: Postherpetic neuralgia

The idea that ultraviolet (UV) rays can inactivate viruses is not new, but this is the first time that such firm conclusions have been made in connection with the varicella-zoster virus, the herpes virus responsible for chickenpox and shingles.

FORBES: Sun's UV Rays May Prevent Chickenpox