Sucking hands is a hunger cue
@Millie not always they also do it to self soothe she sucks her thumb as well and this will be after feeds too
It will go away on its own.
It will go away on its own, but you can just clean with cotton wool and water
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It will go on its own after a little while. If you're breast feeding express some milk. I found doing this with a bit of water on a bit of cotton wool cleared my babies up within 2 days. When it was like that and it cleared up after 3 days when it came back and was 3 time as much as your current photo