<s>[INST] hi i donated blood on april 29. I m 17 years old. i have a bad bruise and a lump were the needle was. I did everything that the directions said and the bruise got worst. It still hurts when i move my right arm. Should I get it checked by my doctor now since its been a week? Today may 5 i felt a little dizzy and the bruise is still on my arm and hurts. So what should i do. [/INST] hi.the swelling might be because of an inflammatory reaction secondary to the needle puncture. alternating lukewarm and cold compress for about 5-10 minutes will help decrease the inflammation. a little pain or discomfort is also common with this inflammatory reaction.hope this helps.good day!!~dr.kaye </s>