Thanks for the query..Numbness
of the vermilion border of the lip after removal of mucocele
is most probably due to injury
to the terminal nerve
The incision for the removal of mucocele is not that deep to damage the main nerve so do not worry..
You should wait and watch as the nerve fibres will gradually recover..
Wait for a month and watch if the numbness subsides..
If there is no improvement, you can get checked by an Oral Surgeon or a Neurophysician..
For now take Vitamin B complex supplements as it help in nerve repair and regeneration..
Hope this helps..