Alright so i have my model all uv’ed and i made a texture in photoshop and applied it, everything seemed okay while i was in textured mode but when i render or put in shading mode the left hand stays gray. Please help as fast as possible, thanks 
check in UV edtior if the image is over the side your talking about
also make certain all the normals are outward or it won’t show the texture
hope it helps
I already tried ctrl+n on my hand and yes it is over my hand uv, i’ll try to take an image of my model but now im at school .
Remove doubles? Probably tried that. Doubles and incorrect normals, as was suggested, are the biggest culprits.
show a screenshot