Yesterday I noticed a small injury to Chuck's shell. It looked and felt like the intersection of several scutes was being pushed out. Today it appears larger and I can see that something puhed under the edge of the scute puncturing it. Do I need to take him to the Vet, or is this a common injury that I can treat? I have no idea what caused the injury. I have a hunch that it happened while he was pacing along a chain link fence.