Oooooh That sounds as if it is pretty bad. Perhaps you can call an antique store, and ask what they use to repair furniture that is in this condition. Or a Furniture restorer might be willing to share a hint or two. Look in the phone book for someone near you.
Guess about the best thing you can do is to place a large flower arrangement on that area of the table. Or a glass dish with several sizes of candles, and some little rocks, or sea glass. If you can sit something there to cover it, or to disguise the marred place, it will keep people's eyes off the bad part of the table.
This is a rather complex furniture repair issue and ideally should be left to professionals (depending upon the quality and value of the table). In answering, I'll assume the table isn't a valuable antique.
Try using a pressing cloth over the bubble with another, single-layer towel on top, and taking your iron on "steam" setting, try and warm the bubble sufficiently to re-activate the old veneer glue underneath and re-press the bubble back down.
You will likely have to put something weighty on top until the glue is dry again. Be careful not to place something so heavy that it indents the now softened wood.
If that doesn't work, you might try using a very sharp blade to slice a small spot @ the edge of the bubble, and using that slight opening to insert an amount of thinned wood glue using a syringe or metal needle-nose paint applicator (craft store have these). Weight the bubble until glue is sufficiently dry, again, taking care not to leave an indentation mark. (This will work best if the veneer is warmed and more pliable, as above.)
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