As shown below, there is a scene in the movie in which a specific interaction between Will and Molly corresponds, somewhat, to one between Francis Dollarhyde and his coworker, Reba.
In the scene in which Dollarhyde and Reba are conversing in one of the rooms at Gateway Labs, we note that at one point Reba starts to put her hand on Dollarhyde's face (to see if he is smiling), and he grabs her hand before she can touch him - this behavior is due to his being very self-conscious about his cleft lip.
Above left: Molly tentatively reaches her hand toward the wound on Will's face (from Dollarhyde cutting him with a fragment of glass), and then she withdraws her hand before actually touching him. Above right: Will's healing wound, which will no doubt leave a scar, symbolizes his own psyche healing after his having been inside the killer's (i.e., Dollarhyde's) mind.