Back pain generally subsides given that the rash begins to further improve, other than in people that develop postherpetic neuralgia. Typical symptoms of standalone sciatica relate to nerve pain radiating within the lower back down the leg, usually called sharp, shooting pain or numbness. Without shingles, there's no rash existing. https://www.theorthopaedicandpainpractice.com/exploring-non-invasive-treatment-options-for-relieving-lower-back-buttock-pain/