Does blepharitis always make your eyelashes fall out?

Only if severe: Most blepharitis does not attack deep enough in the lid tissue to cause the lashes to fall out. Most blepharitis is not that severe and while it should be treated , lash loss is not likely. If your lashes are falling out, there is almost certainly another cause.

No: Blepharitis can be associated with loss of eyelashes but not always.