Old lip scar on lip is now feeling numb. what is causing this and what can i do?

Numbness: Here is some general information re numbness: http://patient.info/health/numbnesspins-and-needles You will need to see a doctor for full review. If this is new onset numbness please seek urgent medical attention to exclude serious such as stroke.

Lip: Sensory nerves cannot penetrate scar. Either leave it alone or get intralesional cortisone injection, 2-3 at 3-4 week intervals. this may soften up scar. Return of sensation +/- Can have scar excised. No subcutaneous or dermal sutures (will causes more scarring. I use 4-0 silk interrupted sutures.