Oh oh oh I had that with my DD!!! Does it hurt more if you touch the spot lightly rather than push on it?? Mine did & that was the way my Ob would question me on it, a light touch with my fingertips on the area was really painful.
ANYWAYS, he told me it was neural stretching, the nerves endings under the skin are stretching & c#ap it hurts!!! Mine was at the top of my tummy smack bang in the middle just under inbetween my bb's

HTH!