Rigging Problems!

I have a human model and after rigging it I found that when I try and pose the model there are vertices on the limb I’m trying to move that stick in their original position and dont move with the limb, thus making it look all deformed. Note that many vertices on the limb move how they are supposed to, but just a few dont. I’m not sure what I’m doing wrong. Please help. Thanks.

What method did you use to parent the mesh to the armature? In any case you can fix this by weight painting the mesh. Put the armature in pose mode, then select the mesh and go into weight paint. You can pose the armature by selecting bones and moving them, then painting the offending vertices so that they snap into place.

Perfect, it works now. Thanks!