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What is the tiny white dot on the screen of my Alcatel Pixi 4 (5)?

I saw a tiny white dot on my screen, at the top left. Why is this happening? Is it a dead pixel? It doesn't appear anymore but if it ever appears again, how can I fix it? Thank you :)




Open a plain black image in full screen, if it shows a white dot, then that's a dead pixel.



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