I seem to remember that when O.B. talks to Mobius in the control room he says something like "and then your skin will peel away and you'll die" Mobius absentmindedly writes "Skin?" in the dust, so that's why it's there. Could be misremembering though.
That's how I remember it
Same episode, Loki skips ahead to the future. He knows that it is the future this time, instead of the past as was established previously in the episode, because of the writing in the dust.
Dust is mostly skin…
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