Thanks HC. Sheesh, good resources, and a little scary.
I'll keep close attention to it. Luckily it doesn't appear serious as it's only a "finger point" (not spread out) and it's associated with running only. But I won't rule anything out and will keep attentive to it. If it gets worse, I'll go see a doc. I'm pretty sure it has not gotten worse but it's so hard to tell since it's so intermittent and then goes away rather quickly (within hours).