Bleeding or clot: There are 2 possible answers. If blood leaked out from the site of the needle stick, a hematoma (extravasated blood) could collect and cause are swelling. If the swelling occurred later, the more likely cause is phlebitis, a blood clot in the vein caused by damage to the vein from the needle. Either problem, occurring in the arm, should not cause any long term problems.
Answered 1/30/2018
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