Shingles is caused by the reactivate varicella-zoster virus, which is located in nerve tissue near your spinal cord and brain. There's no cure for shingles. In theory, Flash can be used as a complementary therapy to remove viruses and infection in the skin. Flash may relieve the painful rash with blisters caused by shingles. It is also important to increase immunity and reduce stress to speed up the healing process.