Hi! My sulcata is about 3 years old now and i just happened to notice today that he has a small hole on the plastron. I'm not sure what it is or how to treat it. Is this shell rot?? Any advice on what should be done? We live in San Diego and he's been roaming free in our backyard majority of time this summer and spending nights outdoors as well. He's made himself a nice little "home" under some succulent plants and it's just dry dirt/soil that he sleeps on. Any advice is appreciated.