I disagree with this assessment. The customer just feels numbness over his left ear ( auricular part).
He does not have any hearing loss or any other neurological signs suggestive of cranial nerve involvement.
the auricular part of the ear is supplied by the greater auricular nerve originating from the cervical spine ( C1-2) to be precise.
The customer gives a recent history of fall. It is likely due to the injury to the GA nerve from the fall.
This is possible without even sustaining any neck injury.
Hence a CT scan of brain will not show this injury.
Instead, he needs cervical spine evaluation if this persists or worsens.
otherwise, this will take its own course & heal naturally.