scurf (n.)

late Old English sceorf, from Proto-Germanic *skurf- (source also of Danish skurv, Middle Dutch scorf, Dutch schurft, Old High German scorf, German Schorf "scurf"), probably related to Old English sceorfan "to gnaw," scearfian "to cut into shreds," from PIE *skerp-, from root *sker- (1) "to cut."