My Nipples Are Different Sizes. Is There a Procedure to Make the Smaller One Bigger So That Both my Nipples Are the Same Size?

Our breasts are not mirror images of each other, but certain nipple and areola asymmetries can be corrected or improved.   I would recommend seeing a plastic surgeon who does a lot of breast and nipple surgery to learn about the options and get advice.

I am glad to hear that you are nearly completed with your breast reconstruction, but sorry to hear of your concerns.  It is common to have some shrinkage of the newly reconstructed nipple - typically between 30-50% of the immediate postoperative size.  I would continue to wait a few...

I am going to jump on the bandwagon with the other responding doctors here and advocate that you don't do anything.  You have a very natural shape to your breasts.  A slight protrusion of the nipple is a healthy, youthful look.  Anything that you might do to change this might be...

Your problem  is more common than you think but usually affects women with overly large breasts not smaller ones. Occasionally reducing the size of very large breasts can restore this function but not usually (see link). .Having no erotic sensation of the nipple prior to your breast...

It looks like you have an infection around the barbell. Both ends look problematic. I recommend you remove the piercing and see a doctor to treat the infection. The sooner you get it treated the less damage there will be.