Shingles can be a reactivation of your chickenpox virus producing a painful rash. The virus has an effect on the nerve fibers and skin causing a painful, itching, burning rash. The realm in the rash is most often over one side of the upper body, abdomen or back. Verywell Health https://www.theorthopaedicandpainpractice.com/treatment-options-for-lower-back-and-knee-pain/