Is darkening of one nipple "normal"? (Photo)

Thank you for ypur questions.  Darkening of the areas can be caused by the dermabond, brusiing, or a postentially partial necrosis.  I would advise that ypu see ypur surgeon today for an examination. Best Wishes.

Hello dear, thanks for your question and provided information as well... I have
to say that you are still early on healing process, it is too soon to determine
how your results are going to be, per now, they look very nice and beautiful,
you can have one bigger than the other, it is normal and that can happen for
the first 3 months until your implants have settle in. I recommend you to wait
and keep using your post surgical bra, that will help you with the shape and
support. Hugs!

A nipple area may look darker from either bruising or poor blood flow after surgery.  Poor blood flow is very unusual with the kind of surgery you had.  Ask your surgeon about the findings in the hear future.  Avoid smoking.