Trauma: The bruising and ecchymosis is normal after trauma, some swelling could be normal or could be internal bleeding (hematoma). A blood clot (thrombosis) is rare after direct trauma but is possible if a vein or artery was directly injured. The only way to get a diagnosis is to see a physician and possibly get a ultrasound of this arm. See your doctor.
Answered 1/24/2021
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