Sore incision with exercise?

JLG95

I had my c-section a little over six months ago.  I started walking/running 2 miles 3 times a week about 3 weeks ago.

Yesterday, my workout was a bit more intense than usual.  A couple of hours later, I noticed a hot spot that was slightly tender in the middle of my incision scar.  The skin isn't raw, but the area is redder than usual and a bit swollen.  I doesn't really "hurt" and hasn't gotten bigger, so I don't think it's infected.

What do you think?  Rubbing sutures?  Am I pulling apart some adhesions in my abdomen?