What are these?

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For the past couple of weeks, I started noticing these very tiny bugs outdoors of my home. Mostly they were noticeable on the concrete. But last 3 days, I have noticed that it may be an infestation of whatever they are. I don't even like having my daughter outside playing because of this. I took pics of these bugs as close as I could and then edited them by zooming in. Can anyone please help me identify these bugs. I live in Southern California.

q what are these
q what are these
q what are these
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