皮膚
ひふ · hifu · JLPT N2 · noun
skin
皮 = hide + 膚 = skin: two characters that both mean skin, so the word doubles the same meaning
皮 names the outer hide or pelt of an animal, and 膚 names the body's surface skin. Together they give ひふ, the general word for skin.
皮 — hand 又 stripping hide off animal
皮 is a pictograph showing a hand (又) peeling the skin or hide off an animal carcass. The original meaning was 'animal hide' or 'to flay,' which broadened over time to mean skin, leather, or any outer covering or surface.