There have been small round gray balls in between the layers of my hypoallergenic pillow cover for two months now. It started out with only a few, then they started to multiply. I tried washing the case but it did not help. I cut open the pillow case and they resemble (pardon me) rolled-up semi-dried boogers. My boyfriend "dissected" them and they look the same all the way through, very elastic and stretchy. I know it's not a bug, but I'm still creeped out. Does anyone know what these things might be?
Note: I have a regular pillow case on top of this hypoallergenic pillow case.

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