infectious diseases
Herpes Zoster
Postherpetic neuralgia
Up to 6% of patients with herpes zoster experience another outbreak ( Symptoms and signs reference ), although this percentage may be higher in immunocompromised hosts. However, many patients, particularly older patients, have localized pain with variable intensity lasting > 3 months from the last crusted lesion in the involved distribution (postherpetic neuralgia). Fewer than 6% of patients with herpes zoster experience another outbreak. The pain of postherpetic neuralgia may be sharp and intermittent or constant and may be debilitating. It may persist for months or years or permanently. 