Stitches Did Not Dissolve After Breast Reduction?

It’s not unusual to use long lasting absorbable sutures when performing breast reduction surgery.  These sutures typically last six to nine months, and are buried beneath the skin.  They are used in an effort to avoid spread of the scar.  They provide support to the wound closure, until the wound has gained adequate strength.
Occasionally these sutures work their way through the skin before they can absorb.  When this happens, it’s not unusual to develop an infection around the stitch.  This can result in a stitch abscess or granuloma.  This is the pimple you describe.
This situation usually requires drainage of the abscess, removal of the suture remnant and possibly antibiotics.  This is a relatively simple problem to deal with if treated early.  If diagnosis and treatment are delayed, then more significant problems can result.
It’s not unusual to have absorbable sutures protrude through the skin following breast reduction surgery. With appropriate care this should represent a minor problem with no long term consequences.  If you have protruding absorbable sutures, follow-up with your plastic surgeon is indicated.

Sometimes dissolvable sutures may work their way through the skin before they dissolve completely, causing irritation or small bumps. If you're experiencing pain and notice a stitch that hasn't dissolved, your surgeon may need to remove it, as they did during your visit. While there isn’t much you can do to speed up the dissolution process, it’s important to follow up with your surgeon if you notice any new or recurring discomfort, redness, or visible stitches. In some cases, the body may push the sutures to the surface, resulting in an abscess or pimple-like appearance, which can be addressed with minor intervention. Keep your surgeon informed of any changes, especially if you experience signs of infection, such as increased redness, warmth, or discharge.
Krishna Vyas, MD, PhD, MHSHarvard, Hopkins, & Mayo Clinic Trained Aesthetic Plastic SurgeonNew York, New York

Hello and thank you for your question!
You should see your surgeon again to have it removed. This may continue to happen, it is not uncommon. Contact your surgeon with any concerns. Best wishes!