Treating new brown spots after Pixel?

I had a Pixel treatment this afternoon. Before I even left the office, I had a rather large brown spot on my forehead. It is about the size of a dime and it literally appeared out of nowhere. This was my 3rd treatment.

Why is this happeneing now and will it go away? On a side note, the "grid" from the Pixel has not appeared over the spot. The spot is not raised like a burn and it does not hurt. Very strange.

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