I have built up scar tissue under my DDD breasts from wearing underwire bras. What happens to the scar tissue after BR?

The scar tissue you describe may be removed in the course of breast reduction surgery, or it may simply be "buried" by the skin reduction and suture closure associated with this surgery. With time, most chronic irritation-induced scar tissue will soften and mature as the irritation is eliminated, but you will likely (depending on the breast reduction pattern chosen by your surgeon) have surgical incisions and the resulting scars in your inframammary creases.These scars, of course, will fade and soften over time as well, but this can take a year or more! Best wishes! Dr. THolen

The scar tissue or irritated tissue under you breasts will likely be removed during the breast reduction. Even if it is not removed, the decrease in stress on the tissues in this area after the excess breast weight is removed should allow it to resolve. Best is to discuss this directly with your plastic surgeon who can examine exactly the area you are concerned with and who can then give you a more specific answer.For more information about breast reduction, check out the link below.For the best results seek the consultation of a plastic
surgeon certified by the American Board of Plastic Surgery. They have a website
listing all the certified plastic surgeons. Members of the American Society of
Aesthetic Plastic Surgery will all be board certified in plastic surgery and
have demonstrated an interest and special skill in cosmetic plastic surgery as
well.

I am not sure why you would have scar tissue to before surgery.  A bra pushing against the fold should not have caused a problem. Best to be seen in person.