Track marks are visible skin changes caused by repeated drug injections. Typically, the marks appear as a linear cluster of tiny, dark puncture sites that trace the path of a vein.
Repeated needle punctures to the skin cause injury to the superficial veins and surrounding tissue. With continued injection drug use in the same area of the skin, the trauma causes small puncture wounds, inflammation, and skin discoloration.
Where Do Track Marks Appear?
The primary areas where track marks form are the inside of the forearms and backs of the hands. The location of these superficial veins makes them relatively accessible for drug injection.
Injection sites where track marks may also be found include the ankles, feet, and groin.
Why Track Marks Are Medically Significant
Track marks can serve as a clinical indicator for healthcare providers when assessing substance use. But they should be considered along with other clinical findings and the person’s history. The marks are also medically significant because continued injection drug use can lead to damaged veins and complications, such as an abscess and scarring.
