Hi,
Please do get treatment - whatever you can - your surgeon is wrong it will not improve with time. Get an MRI.
Also, consult a lawyer.
I donated a kidney and had the incision from the belly button to the back with a rib removed. I noticed the flank bulge and mentioned it to the nephrologist at my checkup. He called it normal healing. Several years went by before I was diagnosed with an incisional hernia (there were 2) and I had a hernia repair for both hernias with mesh. The side was bulging again. I finally found a surgeon who would redo a flank hernia repair - he had me have an MRI and informed me that it was a flank bulge actually, that all the nerves on my side had been severed and the wall of muscle was paralyzed. That wall of muscle will start to atrophy.
Kindly donations are usually done laparoscopically because of results like these.
There are forums for kidney cancer patients I have discovered - their kidney is removed with a flank incision - 50% of the time leading to flank bulge. Did your surgeon advise you of this? Consult a lawyer.
I am looking at major reconstructive surgery. organs are in the wrong place and health issues have developed.
Don't be naive like me. You donated a kidney, so you were in perfect health. Protect yourself now. Get an MRI. Get consultations. and talk to a lawyer. Time will only make it worse.
I wish you all the best.