3 weeks post op Breast Reduction, there is a bar areas and hardness under my breast. Should I be worried?

Thank you for your question.You are describing some hardness or enduration under the incision on both sides of your breast after breast reduction surgery. This is normal wound healing. Scar tissue hits a peak of hardness and redness at 6 weeks after surgery. For the 3 to 6 months after, you will notice a significant softening that will occur while the wound matures and remodels.I hope this helps.- Dr. Bryson G. Richards, MD

The areas you feel may represent swelling or fat necrosis.  An exam is the best way to determine the diagnosis and treatment 

It is normal to feel firmness along scars.  This is the actual scar tissue that forms and over time it will soften.  Most often you just let it be.  Sometimes your surgeon may recommend massage to help speed up the softening.  It is very common and should not cause you any concerns or anxiety.  If you do feel uncomfortable about this, talk to your surgeon.