I am hoping someone can help me with a concern I have with my Nile puffer ( T .Lineatus) I purchased about four months ago. He has a small cyst like bump on the “muscular stump” of his dorsal fin. As far as I know he has had it since I’ve owned him. It changes in size and even occasionally disappears. The other day I noticed another bump on his side (smaller and has since disappeared). Other then that the fish is vary active with good colorings, should I be concerned, if so do no what I should do.