Wiktionary
n. The conspicuous signs of artery and vein damage brought on by chronic heroin and other injection drug use
Usage examples of "track marks".
They'd taken the time to spread their camouflage nets over the redeployed tanks, but that, too, had been a pro forma waste of time, because they could as little hide the track marks of hundreds of such vehicles as they could hide a mountain range.
His gaze was clear, however, despite the track marks that disfigured his arms, and it took him only a second to realize his dilemma.
Then she helped the EMTs throw a blanket over Rosie and her track marks.
In its place was a wilderness of jagged stumps and a tangle of felled brushwood on a ground of mud criss-crossed by the track marks of the trucks.
He got down on his knees to examine the ground carefully, but were no track marks leading from it.