Does this look like a keloid or something else? (Photos)

From your photos, it seems like the blister is due to the tape, not from the surgery itself. The skin will swell and sometimes the tape pulls on the superficial skin too much, causing a blister. This is a very superficial process and usually does not lead to any scarring. It deals nicely with bacitracin and a dry dressing.

It appears that you have a “traction” blister due to swelling of the breast which stretches the skin around the steristrip. It is not a keloid but it can leave a mark on your skin which can resolve quickly or take a while depending on your skin type. Discuss with your surgeon to see what may be done about it. 

Dear jennb492,
it is still to early to start developing keloid. It is hard to tell for sure without an examination but if you are concerned, I would suggest you to discuss your concerns with your plastic surgeon. 
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Thank you for your question. That small blister is likely due to the steristrip that was placed along your incision. It is really nothing to be too concerned about at this stage. I would leave it alone, and just show it to your Plastic Surgeon in follow-up. He or she may recommend putting a topical antibiotic ointment on it. In the interim, keep the area covered so that your surgical bra doesn't rub up against it. Best of luck! 

Thank you for your question and photos. Keloiding is unusual in caucasions, but it can occur. Your photos at 4 days out show the presence of a tape and what appears to be a blister. Blistering under tapes can be caused by allergy to the adhesive or tension. Either  reason is typically short lived. The blister will pop on its own and should not affect scarring. You appear to be healing normally with a modest amount of bruising. Best wishesDr. Morrissey