noun
outer layer; surface layer; skin; crust; film
Refers to the outermost layer or covering of something, such as skin, bark, rind, crust, or a thin film on a liquid. Can be used for both living things and inanimate objects.
See also: 上皮
傷は上っ皮だけで、深くはなかった。
The wound was only on the surface layer and wasn't deep.
牛
Please remove the skin that has formed on the milk.