TT scar hump over scar, 11 months post-op, what could this be? (Photos)

Posted photos are too close up. But appears as you have either excess fat or seroma pocket or both. Best to obtain ultrasound examination of lower abdomen fir dx. Then most likely liposuction or lipo with revision needed. Fees from $5,000-$10,000. Best to virtual consult with.

If the scar is set low which is highly desirable during a tummy tuck the two skin edges will have different thicknesses of subcutaneous fat when approximated. Normally most people have very thin subcutaneous fat layers right in the groin. The thickness of subcutaneous fat is usually thickest in the mid abdomen and those are the two edges that are brought together during surgery.
If there is a significant mismatch then the surgeon should remove fat from the upper incision side to make a better contour.
If this is not done during surgery then it can be addressed as a revision procedure. to me it looks like it’s simply step off with different thicknesses of subcutaneous fat from removing a skin segment with a low incision. It should not be rocket science to improve your contour with either office-based or operating room revision Liposuction.
Ultimately your surgeon is responsible for the outcome of your procedure and you are responsible for choosing that surgeon.
If your surgeon is not addressing your problems accurately then consider having an in person second opinion consultations.
Best,
Mats Hagstrom MD