2 days post breast lift and augmentation, is this nipple bruising or necrosis? (photo)

Nope. That is likely irrigation from surgery in the pocket or just fluid the body produces with surgery. Remember, the pocket the implant sits in was surgically created and that is like a big wound. Wounds make fluid to heal themselves. That fluid will reabsorb by your body over the next several...

Generally, I like for my patients to wait 3-6 months before removing the suture if puckering is still present. At that point, there is a chance that the areola will stretch a bit but not significantly.

During a periareolar mastopexy the skin has to be gathered to make the opening smaller by suturing the large Circle of skin to the smaller areola. This gathering cause pleats which is what you are seeing.  These almost always go away with time as the implant stretches the periareolar tissue out....