Guess I lived a wilder life than I thought... I make Frankenstein seem like he has a clear complexion. How deep would you guess his scar to be? Skin, fat, muscle, bone? It will make a difference. Also, where it is and how it runs precisely?
Well I guess I'll just mention a few other things then.
First off, any damage to bone may cause a number of conditions. One would be bone chips and calcium granules (like grains of sand) to over the years work their way to the surface. Once all of the bone chips are gone, the calcium grains will continue. Damage to bone be it a break or even a chip/gouge/notch will cause pain throughout a person's lifetime with weather/temp./pressure changes and so on.
Like most severe injuries that develop chronic pain, you get so used to the pain that you don't even feel it except during extremes (like weather or health), or oddly, when the pain is taken away. When my hands are deeply massaged, it still stuns me how much pain I am constantly in, only recognizing it when it is taken away.
In any case, dependent upon where the scar is, how deep it is, how well it healed and so on, you might experience tics, uneven expressions (partly due to the damage, yet also due to subconsciously training yourself to either guard or not test the wound/scar). Pain either constantly or at odd times, spasms, alterations in speaking (not fully forming your mouth), seeping from the eye or nose, other crooked features dependent upon how recent the wound was (the skin overly tightened to seal the wound), headaches, etc..
The list goes on and on... Again, where, how severe and how old is it?
K2