question: I have a lump in the center right under my ribs. The area around it is painful. I also have GERD and my esophagus is corroded as well. My acid reflux is worse than ever before. The lump just appeared within the last week after I started using my CPAP machine for sleep apnea. My stomach also bloats and is rock hard in the morning after using it. I stopped using it but the lump is still there.