My son got his bearded dragon about a month ago. When we first got him, it looked like there was a small spot on his tail. It has since gotten worse. I have attached a photo. About 2 days ago it looked like the spot had some dried blood on it. Now today it looks a bit worse, might even look like the tip of his tail is going to fall off. Is there something I can do to help? Should he be taken to a vet?