So whenever I flex my core hard, a hard lump appears in between my second highest pair of abs (fills in the gap between them). It hurts when I push on it, especially on its center. I think (not sure) that it originates from one time I felt a tear-like pain doing a core exercise in that area and had to wait over a month before I could do similar exercises again (this was a little over a year ago). This lump has been present for a while, I forgot about it for a while.