This is the 5018th most frequent Japanese word.
肌
Skin.
The word '肌' refers to 'skin' as the physical surface of the body.
肌が乾燥しているので、保湿クリームを塗ります。
As my skin is dry, I apply moisturizing cream.
Here, '肌' refers to 'skin tone' or complexion.
彼の肌の色はとても透き通っている。
His skin tone is very translucent.
In this case, '肌' figuratively refers to the 'texture' or sensation of touching a surface.