。
The wound on my arm left a scar.
Literal
Arm [possessive-の] wound [topic-は] mark [object-を] left.
傷 (きず) 'wound, cut, scratch' is the general word for injury. 跡 (あと) 'mark, trace' is used here for 'scar' — more literally, 傷跡 is 'scar' as a single noun, but splitting it into 傷 + 跡 is stylistically different. 残す ('to leave behind') is the transitive form, corresponding to the intransitive 残る ('to remain').