[photoshop-beginners] Line around face

I had a photo with two people in it. The face of the person in the foreground was too lit up and needed to be darkened slightly. I went around the face with the magnetic selection tool and darkened the face.
I then deselected the face. The photo looked great on my computer but I printed it out in A3 mind you and the face was outlined by the selection tool. You could see a definate line around the face.
What went wrong?
Thanks for your help.
Iris

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