Patients of this group will receive standard treatment for herpes zoster which include acyclovir 800 mg, 5 times daily administered orally within the first 72 hours and analgesics as needed.

Patients of this group will receive 25 mg bupivacaine 0.5%, plus 8 mg dexamethasone in a total volume of 10 ml (The final Patients of this group will receive 25 mg bupivacaine 0.5%, plus 8 mg dexamethasone in a total volume of 10 ml(The final concentration of bupivacaine will be 0.25%) to be injected beneath the erector spinae muscle sheath) at the desired level under ultrasonography. The concentration of bupivacaine will be 0.25%) to be injected beneath the erector spinae muscle sheath) at the desired level under ultrasonography.

Patients will receive 25 mg bupivacaine 0.5%, plus 8mg dexamethasone in a total volume of 10 ml(The final concentration of bupivacaine will be 0.25%) to be injected in the Paravertebral space at the desired level under ultrasonography

Patients of this group will receive standard treatment for herpes zoster which include acyclovir 800 mg, 5 times daily administered orally within the first 72 hours and analgesics as needed

Persistent herpetic pain after 3 months will reported as post herpetic neuralgia (PHN)

Visual Analog Scale (VAS) at baseline, 3, 4, 12, 24 weeks

Rescue analgesia in the form of Acetaminophen in a dose of 1,000 mg will be given if Visual Analog Scale (VAS) ≥4