Worms (?) on FFP2 mask (better quality) - What are they?

I did another try to film the „worms“ (don’t know what they actually are) on one of my FFP2 masks which I unpacked yesterday. This time I used another camera setup which made it possible to get much closer. There are around three or four of them which I chose because they seemed to be most active. The biggest ones are 2 or 3 millimeters in length. They are recognizable with the naked eye but then they still look like plain filaments. The procedure was as last time: 1. I breathed on them (because without breathing they will remain motionless); probably they need thermal energy and / or humidity to get active. 2. While breathing they already started to move. 3. Then (after breathing on them) I’ve put them under the magnifier and started to record them which is what you see in the video. There is no air movement involved during the recordings. This also means: You only see their movements when they are losing energy again. I was not able to breathe on them appropriately while they were under the magnifier