When you push on the bump, does the laminate move back? If yes, then squirt a little adhesive behind the laminate and clamp. You can get these little glue syringes and you could drill a tiny hole through the laminate and squirt the glue through that. If the "bump" can't be pushed back, then it is likely due to the particle board behind it getting wet and swelling. If that is what happened, there is no simple fix...