It's hard to say without a photo. The laser handpiece is a rectangular shape which can pull up pigmentation in a grid-like pattern. Potentially, if there wasn't a proper overlap, you can have missed areas which appear like a grid. I would suggest letting it heal for at least two weeks and have your technician re-evaluate if subsequent treament is needed.
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Posted to Normal To Have a Grid-like Dark Brown Lines Across my Forehead After IPL? How Long Will This Last? on 23 Jan 2013