The word "疤痕" is formed by combining the character "疤", meaning scar, which consists of the radical "疒" indicating injury and the phonetic component "巴", with the character "痕", meaning mark, which also uses the radical "疒" for injury and the phonetic component "艮". Together, these characters semantically reinforce each other to specify the meaning of a scar as a mark left from a healed wound.