<s>[INST] Hi i had a blood test done over a month ago and that was ok then approx 2 weeks later i experienced a painful lump under the skin below where the needle entered its still there and is quite tender. I had a doctor look at it and he said it should go away but ive never experienced it before What do you suggest? [/INST] It is probably a small hematoma or blood collection which would have solidified or calcified. It might regress without any treatment but if its painful you should apply Heparin ointment and take some anti-inflammatory medicines like Diclofenac sodium. If it has solidified then it might not disappear with conservative therapy. But don't worry about it, it is not going to be harmful. Take care, Chat Doctor.  </s>