I have MOC MEGO Spock and Uhura figures and I've noticed that, since the last time I looked at them, there has been some action going on in the collar area of their respective shirts. It almost looks like a moldy-type of thing all around Spock's collar, a greyish fluff of sorts. The card that Spock is on is not mint so I'm wondering if at some point it may have gotten a bit wet. The Uhura card is in great condition and there is only a bit on her collar. Any thoughts? Helpful advice would be appreciated.