Why does a small black dot appear on the left corner of my screen

So I was scrolling through youtube and noticed a very tiny black dot appear in the left corner of my screen I was threatened to be hacked already and got hacked so I dont know if that has to do with it but it only happens like once a week or so it appears just next to my time and dissapears after like 30 seconds I’m on a Samsung A20 btw

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