Welcome to HCM.
I can well understand your plight. PCOS
is not the cause of uneven growth of the breasts. Most likely they were genetically determined to be like that.
However the larger breast needs to be examined to check whether any breast pathology has caused it to be bigger or is it just natural.Metformin
is the treatment for PCOS. It does not cure PCOS, but assists in getting pregnant. Now that pregnancy
is not your problem, you could try to loose some weight. I know it's easier said than done.
For the smaller breast you could use padding, so as not be embarrassed in social gatherings. Another alternative is plastic surgery
Wish you all the best.