The word "瘢痕" is formed by combining two characters, each with the "疒" radical indicating a relation to skin or bodily conditions. "瘢" consists of "疒" and the phonetic component "般" to denote a scar, while "痕" consists of "疒" and the phonetic component "艮" to denote a mark. Together, they create a compound word where both characters semantically align to refer to a scar or blemish, with the shared radical reinforcing the meaning.