I've been noticing that a majority of the DVDs to pass through my hands of late have milky swirls that look like blobs in the area around the centre hole of the discs. Not on the data part (milky swirls there are a whole other subject) but on the inner rim. On some discs, they look like bubbles. Just what are these and why the increase in their appearance? Two theories. Either it's excess glue or glue droplets that accumulated there like it tends to do on the disc edges, or it's air pockets or air seeping into the discs. The former is the theory I prefer for obvious reasons. I see it on newly opened discs and have noted it on older ones, too. It's glue or it's air. I'll entertain other theories or any additional observations of the blobs. A word of note. None of these discs show any evidence of rot, but could it be it's rot in its incipient stage.