Should beard hair that falls out be treated in a specific way? Should something specific be done with them?
I'm asking because I remember hearing that there is a kabbalistic idea to do something with them (not sure what).
There is an old Kabbalistic idea discussed here to place them inside a Sefer!
Many Poskim have decried this practice, including R' Ovadia Yosef who is quoted in Kitzur Shulchan Aruch Yalkut Yosef 153:17: וכל שכן שאסור להצניע בתוך ספרי קודש שערות הזקן
In addition to the previous answers, I have heard (I will try to add sources when possible) that