Your skin keeps pulling moisture to all sorts of places.
To keep moisture in, the skin pulls fluid into all it's nooks and crannies.
Your skin keeps pulling moisture「人の肌は潤いを引き寄せて」 to all sorts of places.「角質層のすみずみまで」
To keep moisture in,「潤いをキープするために」 the skin pulls fluid「肌は潤いを引き寄せる」into all it's nooks and crannies.「角質層のすみずみまで」