hi i had gone through your query and understand your concerns. i would come up with the possibility of HERNIA may be the cause for your sufferings.
-A hernia occurs when your internal organs push through a weakened spot in the abdominal wall.
often appear after you have strained your muscles by lifting something heavy, coughing for a long period, or being constipated.
there is another possibility like LIPOMA;A lipoma is a lump of fat that collects under the skin. It feels like a firm, rubbery bulge that moves slightly when pushed
I hope this is helpful for you, thank you