Yes, it very well could be! You'll notice that many/most Thysanozoon sp. have white borders: http://reefguide.org/watermark.php?src=pix/thumb2/thysanozoonnigropapillosum3.jpg
I think you're right, though, because I just found a photo of a Thysanozoon that looks almost exactly like your spotting! However, there's no species name listed: http://calphotos.berkeley.edu/imgs/128x192/4444_4444/0907/0759.jpeg
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