As long as the T's doing it's normal thing, I wouldn't get too worried. If you notice any clear-ish fluid in that area, let us know. Other than that, just keep an eye on it. If it is an injury of some sort, it will likely repair itself in the next molt. When I first got into T's I was the biggest worrier. After a while, I began to see how sturdy (in a delicate way, lol.) T's really are.