scaly
adjective uk/ˈskeɪ.li/ us/ˈskeɪ.li/
(SKIN)
（皮肤）干燥脱屑的
If skin is scaly, it has small, hard, dry areas that fall off in small pieces.
I get scaly patches on my scalp. 我头皮上有些地方有头皮屑。
(COVERING)
（水管或容器内壁）有水垢的
If the inside of a pipe or container that heats water is scaly, it is covered in a hard white or grey layer of material.