dors your husband has diabeties and on any medications for this? if so peripheral neuropathy
should be suspected.does he have any neck pain or injury to the cervical region? if so cervical spondylosis
is a possibility. he has numbness over the left side of the face and mouth which indicates probaby 5 th nerve involvement(trigeminal nerve
) which may also occur in high cervical spine
pathology or in case of possible brain tumour. it is better if he takes MRI cervical spine to look for any pathology.