Festus2 is correct. This is a "blushing" on the wood. This is caused by the moisture in the wood or by any moisture when the finish was applied, such as a very humid day. I have had this "blushing" happen on furniture that I have made. Mostly from wood that still had a high moisture content. A common form of "blushing" would be from a cool drinking glasses left on furniture that leaves a white ring when the glass is removed.
The only way that I know of to remove it is with denatured alcohol, sand paper or fine steel wool, along with a clear lacquer. Not an easy task.
Google "Removing blush from wood" and you should find procedures for doing so.
As also posted, moisture build up from being stored without ventilation my cause "blushing".
Hope this helps
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Charlie, Lu, Nick & Gia
2013 F-250, XLT,Super Cab, SB, 6.2L
2013 Cougar Xlite 29RBS
Reese 16k slider 5th wheel hitch
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