Hematoma: There may have been leakage of blood at the site of vein puncture. It is probably late, but you need to apply pressure and a cold compress. The hematoma will resolve, however, it the site becomes painful, red, ulcerates or you get fever, see a doctor. You are to be commended for doing your civic duty by donating blood. Wish you good health!
Answered 12/8/2017
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