Check to see whether the frog of your bow touches the belly of your violin while you stow it in the carrying case and close the lid. Frequently the bow storage device in the case is broken. If the damage is near or under the tailpiece, you should check to see if the tuner screws are screwed too tightly and are damaging the belly. It might be necessary to have the screw thread shortened so that they dont touch the cover even at their maximum position.