Uneven breasts can be a problem. The question is how uneven is uneven. There are different surgical options for the different problems. The larger breast can be reduced in size. The type of surgery depends on the three dimensional solution to that reduction.
Smaller reductions involve scars around the areola.
Larger reductions extend the scar from around the areola towards under the breast. Even larger reductions extend that scar even further under the breasts near the chest wall. You will need an examination and evaluation to start your education process to find out what options are available for your problem. I hope this information proves of some use. If my office can be of further assistance, please let us know.