I recieved a one month old hatchling from a breeder a few days ago. I have been soaking him daily and feeding him romaine lettuce and thin carrot slices that he can easily chew. This morning he pooped normally but a little while after that I picked him up and noticed this red, but partly clear bump under his tail. I immediately soaked him in some warm water. It was bigger before I took this picture to post and has shrunk down a little. I am new to tortoises and am very scared, did I do something wrong? Do I need to take him to the vet or is it something that will heal on its own? Should I change his diet to fix this? Any help is greatly appreciated