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My name is***** I'm a board certified neurologist. Please note that everything discussed on this site is for information purposes only and does not substitute a visit to a doctor. Please give me a moment to type my answer.
What you are describing is a rare complication of Bell's palsy and it is due to abnormal nerve re-growth and crossing over of signals. It is a particularly difficult disorder to treat and the most succesfull treatment is usually done by injecting botox into the nerve to reduce tearing.It does not result in total absence of tear formation by rather reduced stimulation by the nerve so that in increased tear production does not occur.
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