One breast is bigger than the other one after augmentation (300cc, 250cc) - could it be from leaking? (photos)

If you have a leak in one of your saline implants the implant will eventually deflate. I encourage you to visit with your surgeon who can check the integrity of the implants. If there is no leak you can discuss your asymmetry concerns.

It can be hard to tell why breasts become more and more different over time after a breast augmentation without seeing your before photos, operative report, and initial post operative photos. If your breasts were close in size after your augmentation and the left side has gotten progressively smaller, it is almost certainly in implant leak. If it is a left breast implant failure, the implant should be covered under warranty and your original surgeon will probably want to replace it for you.

Typically, the leaking implant goes flat if you have saline implants. I would go back to your surgeon and discuss your concerns.