Try searching for methods using iron. Read somewhere that the moisture gets caught in the wood, so a hot iron evaporates the moisture

That's not coming out. Finish is toast in that spot. Possibly it may fade over time but that;s about it without stripping the entire table finish and refinishing. Use an iron and you will end up with an iron shaped mark in the finish.

If the wood has a finish with wax in it you might be able to remove with a cloth and iron as suggested by another. Lay down cloth use iron setting without steam apply using the pointed tip of the iron quickly remove cloth let cool to see if circle is gone. If not you could try again leaving iron on a quick bit longer. If the wood is not solid, but glued layers heat from iron could separate the layers.

kinda thought it was obvious not to lay a hot iron on a surface without a cloth! 💡Thanks Diane for expanding on the option 👌

You are getting some bad advice above. DO NOT put a hot iron it with or without a cloth unless you want to refinish the entire table. This is caused by a moisture trap and it's often a hot dish that causes this, the heat opens up the finish, condensation is trapped below, the dish is removed and cools, trapping the moisture underneath. This is called Blush.

There are products by Mohawk finishing that reflow the top coat by opening it back up, then another product called No Blush is applied, that the the entire top resealed. This is not a DIY product, contact a furniture restoration pro who has these products in his kit and is trained on the procedure to do it. They can make it look like new without a full refinish job. Good luck.