[Meet the New Boss]

I would guess that’s the hand of his controller, Valerie Jarett.

Perhaps some sort of operant conditioning mechanism in which she feels his head scar as a way to trigger some sort of behavior.

[freekitty]

If it is Jarrett’s hand; it sure is ugly.

[A.A. Cunningham]

Jarret's complexion and hair color obviously led you to reach that conclusion.