Sorry for late reply and inconvenience.
Thanks for additional information.
I understand your concern.
Well as you describe,possible causes may include
Diastasis recti. This is basically a separation of the two abdominal wall muscles (the right and left rectus muscles).
A hernia (which is due to weakness in the muscles of the abdominal wall).
As it is painful and increasing in size so I do recommend that you follow up (non-urgently) with your regular doctor to confirm the diagnosis.
If you develop a sudden onset of pain in the the area, go to the ER.
Prevent constipation and eat fiber rich diet.
Also avoid any strenuous physical activity for a while.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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