After breast reduction surgery it frequently takes a while for the healing to be complete. During the process of healing, scar tissue can form along the incisions and also within the breast (fat necrosis.) Your body usually improves this scar tissue in a process called scar remodeling over the course of the first year to 18 months. If there are areas of discomfort afterward, a re-evaluation is appropriate to determine whether or not anything can be done to improve the result.
Not everyone gets these scarred uncomfortable areas. They are more common in larger reductions and in smokers.