Hi guys I just created this account to seek answers about a problem a friend is having. He just started IVing heroin and after several uses the vein he was using in his arm is no longer visible, and no longer available to use for injection. This is not what he is worried about, he realizes that it is just a collapsed vein. The problem at hand here is that there is a fairly hard bump right beneath the injection site. Theres no pain, no redness and when his arm is extended straight out it is definitely noticeable. The bump is very hard, and can be pushed on without feeling any pain. Does anyone have any answers to what this may be and is it something he should be worried about?
