Do doctors use permanent stitches underneath the nipples for a donut mastopexy? (photo)

Some do some do not.. I use long lasting temporary or dissolvable sutures (Monocyril) if the donut lift is a smaller one. Verses a larger lift I use a Prolene suture that is permanent../

The most effective way to perform a donut (or peri areolar mastopexy) is with a permanent stitch (either gortex, mersilene, ethibond, or prolene) in the deep tissue to prevent scar widening. Most expert plastic surgeons use some type of this longer lasting stitch. If this stitch becomes exposed you have a big problem and the stitch needs to be removed. However, there are more layers on top of this stitch that are absorbable. Most likely this is a more superficial absorbable stitch that your body is rejecting. See your plastic surgeon to examine you. 

Good question- permanent suture may have been used depending on your plastic surgeon's technique. There are different reasons, pros and cons for either using permanent or absorbable suture used in any particular donut mastopexycase. Talk with your surgeon. best wishes!