Over the last few months, I've noticed a strange phenomenon happening on my 1968 Dove that worries me. It's always been stored in its original hard case and is humidified in winter. When I first noticed it, I thought it was just a dull scuff kind of thing. I polished the area and thought that was the end of it. Then today, while doing my weekly refill of the humidifying device, I noticed it was worse. Do I need to remove the pickguard to spare the guitar? Looking for advice. Thanks.