It happened to me. It’s a ruptured vein, often caused by the needle being pushed right through the vein to the other side, instead of the tip of the needle stopping inside the vein.
You get a big bruise. Any internal bleeding causes a bruise. That’s why you get a bruise when your flesh is hit really hard by something; blood vessels rupture. It is usually not harmful, it’s like any other bruise. In my case the nurse just found a vein in the other arm.
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