I went in to donate my usual Double Red Blood Cells (they take 2 pints of just Red Blood cells and that means I only donate every 16 weeks). Maybe I should have realized things would be bad when the person setting up (not the tech who put the needle in) set the machine up for platelets. I had no plans and would be able to donate both the platelets and double red so I said I can do both. The Machine 'draws' the whole blood then 'returns' the part of the blood not being donated along with some saline. The Draw was fine but the Return was uncomfortable there was a burning pinching feeling in my arm so I told the tech. He messed with the machine and tried to pull back a little on the needle. When the return started again there was still some pain but it did feel better (There should be no pain at all). Well when the tech looked again under the bit of padding that covers where the needle goes into the skin we can see that I am bleeding around the needle (In case you don't know that is not supposed to happen at all). The Tech tried moving the needle again to fix the problem but still I bleed, but now the pressure for the draw was too low (no blood was going into the machine). The Tech and one other person was trying to fix it but could not get the pressure to go up and they could feel a knot forming at my elbow (just above the bend) and so the whole process was stopped. I was given some cold and heat packs I was told for the first 24 hours to use the cold packs and then tomorrow use the heat packs to try and help the swelling (which I already have some of) and to help the bruising that will happen. From what they can tell the way the needle was sitting in the vein the return was not going into the vein (which is why there was the pain). That is the first time that has ever happened to me. I think next time I will donate from my left arm instead of my right just to give it a break. Even though they got nothing usable from me I still have to wait 8 weeks (the same wait I would have to wait for a whole blood donation) before I can donate again so I will have plenty of time to heal.