I had 4 Stellate Ganglion Blocks several yrs ago for my Trigeminal Neuralgia. They didn't put anything over my face. I just remember being wide awake with my head tilted far back and being told not to swallow during the injection which was a combination of Lidocaine&Marcaine. One of the side effects they always looked for was that "drooping eyelid" to tell whether or not they'd gotten it into the right location...was no floroscope used during any of mine at that time. First one relieved 90% of my pain, second increased the pain about threefold. Third one relieved the pain again, fourth one increased it, after which the pain management dr. which performed them said that he wouldn't do any further ones since I didn't seem to have an actual "trigger spot" with my pain. By the way, I shall not mention where they were done, but it IS a world known facility and they did not cover my face with anything as a precaution so I too wonder if that was really necessary.