What physical sign may indicate narcotic use through visible marks on the body?

Fresh puncture marks are a clear indicator of narcotic use, particularly those substances that are commonly administered through injections, such as heroin or prescription opioids. When individuals inject these substances, their skin is punctured, leaving noticeable marks, often found on areas like the forearms or between fingers. These marks can appear red, inflamed, or may have scabbing if they are recent or if there have been multiple attempts to inject in the same area.

In contrast, swelling in the limbs, bruising around the eyes, and severe weight gain may be associated with various medical conditions, trauma, or other factors, but they do not specifically indicate narcotic use. While some individuals using narcotics may experience weight fluctuations due to various physiological effects, it is not a reliable or direct sign of narcotic use. Similarly, bruising or swelling could point to other health issues, making fresh puncture marks the most definitive and directly linked physical sign of narcotic use.