Unless urates/fecal matter can become perfectly uniform in size and shape, and be perfectly smooth i doubt thats what it is. Here are some pictures, you can see the bulges around the eggs/impactions in a few of them.
http://i280.photobucket.com/albums/k...ortech9/bp.jpg
http://i280.photobucket.com/albums/k...rtech9/bp2.jpg
http://i280.photobucket.com/albums/k...rtech9/bp3.jpg
*Edit: A qualified herp vet is hundreds of miles from me at the moment and I cannot afford the trip and treatment as of right now. I havent a scale at the moment so i cannot help with that but hopefully the pictures can give you a rough idea what im dealing with for size of animal. I know the responsibilities of taking a sick animal require me to give them all the help they deserve but for right now I have to do what I can on my own. Thank you for your replies, I need all the help i can get