I feel an abdominal mass that is above my belly button but moves around and i only feel it when i lay down, what could it be?? it is not painful.

Abdominal mass: Could be a couple of things . If you can push it all the way in and feel a hole in the abdominal wall it could be a hernia. It honestly sounds like a lipoma ( collection of fat cells) or a fibroadenoma ( collection of tissue cells) both of which are nothing to worry about but I would go to your doctor and let them check it out and feel it to make sure it is not anything else .