I Have Donated Plasma 4 Times.3rd Time I Clotted In

I have donated plasma 4 times.3rd time i clotted in one arm and they re stuck me to finish in the other arm..i have a benign or not noticeable pain in clot arm but if i stretch arm or touch it not at the needle site but down forearm it is oddly painful.now i just noticed in my other arm where needle stick site is i have a pea size moveable bump or nodule