When your two breasts are significantly different in size or shape, you typically have the following options. First of all, make sure you are no longer noticing any more changes such as changes due to pregnancy, hormones or birth control or weight loss or gain. Then you can consider either augmenting the smaller one with an implant, reducing the larger one or a combination of both. A reduction will result in scars around the areola as well as vertical scar from the areola to the breast fold and perhaps a transverse scar in the fold. For best long term results, it is ideal to end up with equal sized implants, equal amount of breast tissue and equal amounts of skin. Frequently, I recommend an augmentation on the smaller side along with a reduction and placement of an implant on the larger side. Be aware that the reduction involves removing some natural breast tissue and will probably prevent and future breast feeding on that side.