I.e growth phase, regression phase, resting phase and then shedding phase
So don't worry the beard hair which is falling off can be in exogen phase
If u feel they are not growing back in that place or can see new patches in beard visit a trichologist or dermatologist.
You shed some facial hair daily due to the natural beard growth cycle.
Beard growth is fueled by male hormones, lower levels may cause beard loss.
Both the scalp-hair and facial hair can be lost due to chronic stress.