Lightroom II / CS2 help

[dutchpuzzle]

I have an image to improve, which is of a person in shade (so he is underexposed) and a background which the camera exposed for. So, I have used the adjustment brush in Lightroom and, basically, darkened the background and lightened the person. It has done a pretty good job except,- there is an obvious line round the edge of the person's face - it's a grey line. Any tips? I have Lightroom 2 and Ps CS2. Also, the shot was taken with a D200 at iso 400 and the person's face is quite grainy, so tips (other than taking down the clarity in L2 would be appreciated too)
Thanks in advance!

[geoffL]

Hmmmm difficult to tell without seeing - why not post the image to help....

[Meredith]

I would do this in CS2 and you can get rid of the grey edge by careful masking.

[Monobod]

I am not familiar with Lightroom, but did you use a selection tool with a feathered edge or a hard edge?