I just fed DaVinci the day before yesterday, and around 10 pm today I gave him a bath. He soaked in there for about 10 minutes, then I dried him off, and held him for a while. It wasnt until then that i noticed a small bump towards the edge of his tail. Could it still be a digestion problem? I touched it gently and it didn't seem to bother him; it didn't feel like it was liquid-filled or anything; more firm. Friday I'm taking him up to the vet again for a check up, so I'm going to ask about that, but does anyone have any ideas as to what it is?