This is common among recreational drug users. this happens when the needle is put into the vein and the person injecting moves the top part of the needle in any direction but that of which it whent into the skin, depending on the gauge of needle it can be very easy or fairly difficult to do this.
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{{Information |Description={{en|1=An hypodermic needle in the arm of a person who has used intravenous drugs.}} |Source={{own}} |Author=Jmh649 |Date= |Permission= |other_versions= }} Category:Medicine