Postherpetic neuralgia (PHN) is a nerve pain (neuralgia) that persists after the shingles rash has cleared. If the pain from shingles goes but then returns at a later date, this too is called PHN.
This is a companion discussion topic for the original article at https://patient.info/skin-conditions/shingles-herpes-zoster-leaflet/postherpetic-neuralgia