Not Enough Fat Removed After Liposuction?

You have two issues. The first is that you just had liposuction. It can take several weeks to months for the swelling to resolve. Second, if you have c-section scar, the tissues may be contracted in that area which causes the tissues above the incision to balloon over the scar. This can only be helped by revision the scar or, possibly a miniabdominoplasty. If you post pictures, we may be able to give you more specific advice.

 The area that you are concerned about often needs excision to remove the redundant tissue that overhangs the old scar. Liposuction can help, but like in your case it did not give you the desired result.  However, the firmness will soften with time as the swelling subsides.