Massive bruising(up+down half of arm)following blood draw.been 5 days.pain/aching/sore throughout arm. concern for blood clot or anything else?

Hematoma: If you had just blood draw most likley vein " burst" and there was blood " spilled " to subcutaneous tissue creating massive hematoma - discoloration blue. it is tender and sore. best is to place ice to begin with and than " damp heat " as towel rinsed in water and place on and one more layer dry towel. It is NOT a blood cloth. Cloth can occur more after IV indwelling catheter for while.