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.
If the ascendant sign is not from the same nature of the request or the requester, the invocation would be meaningless and; the requester bewares! - Picatrix (Andalusia, ~1000.AD)