About 6 days ago my bottom lip is unable to move partially in the direction down and back. As when I open my mouth wide the bottom left does not want to open wide like the right bottom side does. It still is covering my teeth . I did nothing to cause it, no hitting, scrtach, sickness, no pain , no stiffness , no bruising, no lumps or bumps in that area or near by. Nothing is swollen or hurts or out of the ordinary except I can t move it normally like I could a week ago? Is this a nerve or muscular problem? Bels Pasly? Or any insight on what it could be and should do?