Lyme Disease Condition_symptoms How Often Is Bells Palsy A Symptom Of Lyme Disease? How Accurate Are Blood Tests For Lyme Disease?

How often is Bells Palsy a symptom of lyme disease? How accurate are blood tests for lyme disease? - lyme disease condition_symptoms

My son was put on steroids after the diagnosis of Bell's palsy. Then he was bitten by a deer tick 5 months prior to symptom that worries me Lyme disease. The blood test has been completed and was negitive. Steroids can cause false negitive?