Hard lump under incision? Could it be scar tissue? Should it be going away by 3 months?

The firm lump you are feeling is common following a tummy tuck.   As mentioned, fat necrosis in one likely culprit.    This occurs because of poor blood supply in the area, and/or, a fat lobule is trapped in the closure sutures.     Often these do get better over time and sometimes go away.         If it bothers you after a year or so, talk to your plastic surgeon about possibly excising it in the office. 

Thank you for your question.It is possible that it is scar tissue, at 3 months you are still healing. There is still swelling present as well at 3 months. I would recommend having the lump looked at in person to determine exactly what is going on. 

Hi there,
What you experienced is not uncommon as all healing and scarring takes 12-18 months to fully mature!
The scar will fluctuate in a variety of subjective and objective ways especially in the first 6 month post op recovery period. I think what you're describing is consistent with some internal induration from the internal scar tissues and provided all your surgical wounds are healing well and strong, you should try some aggressive localised massage with bio-oil to help soften the area. Mechanical modulation at this post op period can be quite effective but of course it'll be best to double check with your surgeon at your next post op follow up visit.
Hope this helps.
Best wishes
Ellis Choy