Donated blood 6 hrs ago. having tingling in hand and a painful lump at the injection site. donated many times before, this has never happened before ?

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!