How to you tell if a vein is collapsed. If it is collapsed, dose that mean the whole vein is collapsed or does it just collapse in one spot. For example. I was having a really hard time getting the needle into the vein a lil while ago, so i pulled it out, and moved up a lil bit on my arm, but it was the same vein, and i got it in first try, but now the area i was trying first, the skin there is bruised. Is that just from poking around trying to get the needle in, and it caused irritation and bruising ? , or does that mean its collapsed. The only sign i've been told of is bruising, but like i said, i moved up on my arm a lil bit, and got the needle in, but it was still the same vein, just a inch or two farther up my arm. So i dont think it is, but just wanted to hear some opinions, and also find out what the signs are, and how to tell if you the vein is collapsed. Also, if a vein does collapse, will it heal ?