I was 100% convinced it was a skin flap/tab too, it looked perfect with no seam/color difference at first. Then some guy said zoom in there's a line and that it looked like a bandaid. I zoomed in and there's absolutely a difference in color between the supposed tab and his skin and it's almost definitely a bandaid based on what it looks like.

Trust me, I'd much rather it be a tab that undeniably proves Biden is an actor in a mask. Just doesn't look like that upon closer inspection.