Crazy Particles! What should I do?

Right now I have a small tuft of hair on one part of my mesh, and I have rigged some facial expressions using shape keys. But whenever I change the shape key values, or move any part of the mesh, the particles go all over the place and I have no idea how to keep their original shape. Any suggestions or ideas why this happens? Thank you very much for any suggestions. :slightly_smiling_face: