Dwain, the problem with defects of this kind is that the wood underneath the URUSHI will dry out and the shrinkage will cause larger areas of lacquer to become loose. In the end the SAYA will probably crack open. There is no fast and easy way for an aesthetically satisfying restoration, but I suggest that you have it done soon by a lacquer expert. By the way, most SAYA will dry out if left without a blade or a TSUNAGI, especially in our Western homes with a heating system. Almost inevitably, the lacquer of old KOSHIRAE will suffer so that the SAYA needs repair or even replacement. The texture of your SAYA was done with salt mixed into the URUSHI. After hardening (URUSHI does not 'dry' but hardens by polymerisation), the surface is ground even and the salt is washed out of the surface with water. You will immediately understand that a small scale repair will be very difficult if not impossible.