I donated blood on 10/5. Never before has this happened in my 17 yrs of donating blood, but the blood stopped flowing. The tech removed the needle because my arm started to swell. Friday 10/7 I had a small bruise, the swelling was still there. Saturday 10/8, I had purplish-black marks spreading down my arm, as well as reddish marks on my elbow, which feels like a bruised bone. Again, swelling still there.
Is this something I should be concerned about? Why did I bruise worse, 4 days after the fact?