Ava has had a small bump on her right elbow for several months, and I had the vet look at it when I first noticed it and she said that it was likely due to pressure on the elbow when she sits and lays down. (She does put the most weight on this side when lying on the ground.) I have checked it periodically, and it has definitely gotten bigger. She is due for a nail trimming anyway, so I am going to take her in this week to get it looked at again, but just wondering if I should be concerned about it? It is completely moveable, not attached to muscle or bone--just inside the skin. No discoloration at all, and no hair loss on the site.