Black spots on render

Support Lighting and Rendering
1

So I have made a Minecraft rig (How creative of me) and have set up shape keys for the face but when I move the mouth there is this black stuff on the render.

http://i.imgur.com/HrIXK.png
HrIXK.png1920×1080

.blend: http://www.filedropper.com/untitled_4

2

Bump’in…

3

Most common cause is z-fighting from overlapping faces.