R.J.
I only "bruise" when I bruise the bone (awesome lymph system clears away little stuff before it shows). This only show up 3-5 days later. They're pretty awesome. Black & Red masterpieces in an homage to gravity.
I don't, nor have I ever had, leukemia.
That said... Whenever you feel something is abnormal, that warrants a doctor visit in my book.