âSkin Poppingâ due to the accidental subcutaneous injection of illegal opiates. âThe drugs are usually injected into hand and forearm veins, with the occasional inadvertent arterial or subcutaneous injection. As substance abusersâ veins are damaged and become unusable, skin popping is more common, as well as use of veins of the upper arms, neck, legs, and groin. There are reports of some users preferentially injecting in groin veins, believing it to be more discreet and easier to hide from family members.â Source















