Follow-Up Question: 3 months post op breast lift/augmentation and I have a tender lump. PS thinks it's a stitch. Thoughts?

You probably do have a stitch that instead of absorbing is trying to break through. Once dissolved or removed, it should heal up well. Your primary care physician could open and remove it under local if needed.

Dear Turtle Doves,
it is hard to tell for sure but based on your photos, it does look like you have a problem with a suture. I would suggest you to follow your surgeon's instructions. If this doesn't improve, your surgeon might need to remove the suture in order for this to resolve. 
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Most likely it is a suture that is working its way to the surface which can happen after surgery. It would be best to discuss this with your plastic surgeon and ask if the sutures they used in this area were dissolvable. This may pass with time or the suture material may surface. Discuss with your plastic surgeon if they think you need antibiotics. Depending on what you had done and if there is an implant present they may decide to put you on antibiotics or not.