1Skin — the tissue covering the surface of the body; commonly used when describing its color or condition, as in 'fair skin' or 'skin care'.
毎日クリームを塗って肌の乾燥を防いでいる。
I apply cream every day to keep my skin from drying out.
日焼けで肌が真っ赤になってしまった。
My skin turned bright red from sunburn.
赤ちゃんの肌はとても柔らかい。
A baby's skin is very soft.
この化粧水は敏感肌の人にも合うように作られている。
This toner is made to suit people with sensitive skin too.
2The body in the sense of intimate physical closeness between people; used in older set phrases such as 肌を許す ('to let someone become intimate with one').
小説の中で、二人がようやく肌を許し合う場面が描かれている。
The novel depicts the scene where the two finally become physically intimate.
「肌を許す」というのは、体を許すほど心を開くという意味だ。
'肌を許す' means opening one's heart enough to allow physical intimacy.
3The surface, grain, or texture of an object — for example, the feel of wood or fabric, as in 肌触り (texture) or 木肌 (wood grain).
このタオルは肌ざわりがふんわりしていて気持ちがいい。
This towel has a soft, fluffy texture that feels nice.
古い木造の家は柱の木肌がむき出しになっていた。
In the old wooden house, the bare grain of the pillars was exposed.
陶器の肌には作家ごとの独特な質感がある。
The surface of a piece of pottery has a texture unique to each potter.
4A person's innate disposition or temperament, or how well their character fits with someone else's — used in phrases like 肌が合う (to get along well) or 学者肌 (scholarly type).
彼女とは肌が合うので、話していてとても楽だ。
She and I get along really well, so talking with her is very easy.
彼はどちらかというと職人肌で、細かい作業にこだわる。
He's more of a craftsman type, particular about detailed work.