There are a variety of explanations for what you are observing and I will discuss some of these options.
I have seen patients who were better candidates for tummy tucks but underwent liposuction instead leaving them with loose skin that appears to be lumpy. If this is the case you may be better treated with a tummy tuck.
Alternatively, any injury can result in healing which produces scar tissue for 6 weeks (proliferative phase) followed by resolution of the scar tissue (maturation phase) which can take anywhere from an additional 6 weeks (total of 12 weeks after surgery) up to 2 years! \
Sometimes this is aggravated by localized swelling which prolongs the firmness. Techniques such as manual lymphatic drainage (also known as the Vodder technique) have been excellent in reducing nodularity. Other mechanical options such as Endermologie are uselful. Another option is the use of technology that claims to reduce Cellulite: these include the Accent device, Velasmooth, or Thermage systems.
I have also found that areas of swelling can be aggravated by certain garments cause such as a tight waistband. Think of a tight sock that causes swelling above the level of the tight portion. In this event wearing a gentle compression garment such as a Spanx is useful for the healing period.
I strongly advise that you perform massage of the areas as much as possible during the healing period to promote softness of the firm areas.
Always stay in close contact with your physician. I am confident that they would want you to be satisfied with the outcome. It is possible that a touch up or further surgery is necessary but I would discuss this with your physician.

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