Thank you for helping us by reporting bad content.
What causes that little bulge in the lower belly is tight hip flexors. You can read the explanation in this website: Wold Fitness Notebook.
According to that blog, one exercise that end lower belly bulge is the humble hip flexor stretch (video). Just try the 3 way hip flexor stretch twice a day, for 30 seconds in each position.
LET`S GIVE IT A TRY?