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Kobo devices are prone to very small bright spots caused (I think) by dust caught under the screen. These are most visible when the screen is set to a dark background. Some people refer to these as dead pixels or stuck pixels, but I don't think that's technically what they are. Anyway, they're quite obvious if you look closely. I've returned two Kobos (neither a Forma) over the years because of them. However, my current Kobos (a Clara HD and a Libra 2) have perfect screens with no such bright spots.
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