I am trying to skin a character I made… Everything looks good but the lips. When I give a lip bone full influence of the vertices that correspond to it it freaks out… anyone know why?..
would more than appreciate the help. 
The lips look thin, indicating diffuse weights. The crease on the right side of the pic suggests a bone that’s getting a strong roll. People would probably need to see the rig and the base mesh to offer more info.