Oh shit...I feel for you Wes, the exact same thing happened to me like 3 years ago...not from plasma tho, but regular blood. My arm swelled after couple of days and got all purple/green/blue...and the worst part was that hematoma was sooo big I couldn't even straighten my arm as it was causing craaaazy pain...My arm was hanging on my neck in brace as if it was broken...eventually some creams dissolved the hematoma...best of luck with it!