A scarred face in a dream often centers on self-image and how visible your past trauma feels to others, even when it really isn't. Noticing the scar with acceptance can reflect an identity that's integrated its own history, while hiding it often points to shame about a past you haven't fully made peace with.
The work done to obtain perfumes and to recite invocations is better than the work done with precipitable gases and other spirits. - Picatrix (Andalusia, ~1000.AD)