I've noticed this recently after a half-hour plus run or a heavy
workout on the elliptical crosstrainer: prominent red splotches across
my torso, front and back both. They subside after about a half-hour.
It is worth noting that this summer I contracted a wonderful tick-borne
illness (babseiosis) that landed me in the hospital, and then developed
a head-to-toe reaction/rash to 7-day antibiotic course, clyndamicin,
which was administered with quinine. :-p
In terms of the training performance, I'm fully recovered, but the
blotches seem to "remind" me of the illness. Perhaps just a
coincidence?
-Chuck in Massachusetts