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Dear MaryJean:
Sorry to hear about your Bell's palsy and now some facial swelling. Most of the time we are not sure the etiology of Bell's palsy. Since you have recently had a bout, it might be that your undergoing a flair of the disease. The most likely explanation is that the flu triggered the Bell's again. The utility of using steriods is to allow maximal healing. I think that I would tend to agree with your physician. Short term steriods are, for the most part, benign with little side effects. However, for maximal effect the earlier the better. I hope that your face returns to normal.
Sincerely,
CCF Neuro[P] MD