I think it was just all the trauma to the area...I was not kind to my face, using whatever necessary to dig out those ingrown ones (sorry to be gross). After I stopped all that, eventually the dark patches just went away since I was no longer putting physical stress on the area. I know that doesn't sound too scientific but I hope it helps somewhat.
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Posted to Removal of Facial Hair Via Laser - Worth It on 29 Sep 2009