Multiple: Facial nerve pressure, viruses such as herpes simplex, cold sores, herpes zoster, epstein-barr, rubella, (german measles), mumps virus, tumors and strokes, are all thought to be possible causes. It can occur overnight and it can go away in a short or long period of time. Many people show signs of improvement within the first two weeks.
Answered 9/28/2020
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