Postherpetic Neuralgia
Postherpetic neuralgia (PHN) is a nerve condition that affects skin and nerve fibers, causing a burning sensation/pain that lasts long after the blisters and rash of shingles disappear. The condition usually begins due to the damage caused to nerves by the vericella zoster virus.
It can also occur when herpes zoster vesicles (commonly known as shingles) begun to heal after crusting over. In its initial stages, PHN is confined to a dermatomic area of the skin, but can spread if appropriate treatment is not received.