Over time, my rifle that I built back in 2016 has been developing lumps on the side plate panel, and tonight I just noticed one on the top of the wrist. I've never seen anything like this before on any other finished hardwood product. It was a red maple blank from Dunlap and the finish was LMF Sealer and Wahkon Bay Tru-Coat. The gun is kept in my climate controlled dining room (air conditioned in summer) and it hasn't been exposed to rain or excessive moisture in months. The lumps that I first noticed on the side plate panel at least a year ago don't seem to fluctuate with conditions such as temperature and humidity. Any ideas what is the cause, and anything I can do about it?
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This last picture is just to show the overall grain pattern of the stock.
