The Proto-Indo-European word *rei-
Word *rei-
Meaning scratch
See also Proto-Indo-European: *reik- ‘line, scratch’
Synonyms *kars-, *(s)grebʰ-, *skebʰ-

Comments
Mallory J.P. and Adams D. (2006)

Other words that might be of interest
*peik̂- ‘paint, mark’