Been there, done that... do not want the tee shirt...
I would wager that you had a mild allergic reaction to the little beasty's bite (no, I am not a medical professional, nor do I play one on TV). If it happens again, you might want to talk to your doctor on general principles. At a minimum, give some Benadryl a try, it might keep the swelling down.
I speak from something like experience. A few years back, my wife and I had a simply marvelous two-day cruise across the Presidentials -- cool, dry days and great nights at Mad and Lakes huts. The third AM, as we started down Tuckerman Ravine, naturally the black flies all hatched en masse. We doused ourselves liberally with DEET and soldiered on. Unfortunately, I didn't DEET under my socks (why would I?), and the determined little Forces of Darkness worked their way in there and chewed. My doctor later counted 63 bites -- below my calves, down to my ankles -- when I went in with two gargantuan, swollen tree trunks where my legs had previously been.
This was not fun.
Ordinarily, one good bite, and I get a hard, itchy lump, not unlike your impressively bulging tricep.
