@bomed, I agree with @gingerw that you should see your doctor.

Here's an article that you might find helpful too:
- How to Tell If You Have a Hernia https://www.hopkinsmedicine.org/health/conditions-and-diseases/how-to-tell-if-you-have-a-hernia

Excerpt:
"Anyone can develop a ventral hernia, but those who’ve had abdominal surgery have a higher risk."

Do you feel pain, aching or pressure in the area of the bulge?