Incision: Depending on the technique used, the surgeon will use a scalpel to make one to three incisions in your breast. Breast tissue reshaping: After the incisions are made, excess skin will be removed and the breast tissue will be lifted and reshaped to achieve a tighter, more defined breast profile. Sutures will be placed deep within the breast tissue to support the new breast position.

https://www.verywellhealth.com/a-mastopexy-can-lift-and-reshape-sagging-breasts-2709986