What would cause hardness where the sutures were after Tummy Tuck with Lipo?

After the abscess you have had and subsequent surgery (drainage and removal of suture) you can expect to have a thickened scar that may take months to resolve. I typically will allow at least 6 months for this inflammatory phase to subside before even considering a revision.

 

Dissolving sutures are usually gone by three months, and the return of an abscess may be related to an area of fat necrosis along the suture line which became contaminated during the upset with the sutures. Fat necrosis is an area of dead fat where caught in the sutures. After drainage and control of the infection, the stiffness can persist for a long time, several months. If the hardness is spreading let your surgeon see you right away to confirm the infection is indeed gone.
Best of luck,
peterejohnsonmd