What can I do for flat nipples when fat injections did not help? I've done injections twice and they only enlarged my areola.

Thank you for your question. I would suggest to have an in person consultation with board certified plastic specialized in Body Contour, who knows individualize each patient to give you the better advice.
Respectfully,Dr. Emmanuel Mallol Cotes.-

The way you phrase your description of "flat" nipples instead of inverted nipples leads me to think that you might not have enough nipple projection from development. Some patients respond very well to elongation procedures, but when there is a congenital deficiency, then it  is less likely that a long term improvement can be obtained. Fat injections will likely not help for the long term. A good test to see if you could  achieve permanent projection is to pull on the nipple itself and see if it will elongate to your  satisfaction. If so, then an incision at the base and suture techniques may help. Good luck. 

This is common with many women, I revise them in the office under local anesthesia and is a simple technique.  There are nipple implants but you most likely would need the revision of your inverted nipple(s).

This is most likely a variant of inverted nipples.It is important to understand how this occurs so that you can comprehend the treatment needed.Inverted nipples are due to traction (pull) of the ducts of the nipples -- they actually pull the nipple inwards. Fat injections simply are not the answer.  Treatment usually requires cutting the dusts so that the nipple can be everted.  I have developed my own personal technique for this problem.  You can read about it at the web reference (see below).Good luck!Elliot W. Jacobs, MD, FACSNew York City

Inverted nipples can be tricky to treat, and the suction cup in particular doesn't have a brilliant success rate. In my experience, the most effective corrective method is piecing, followed at a distance by the classic surgical correction. You can find more information at the link below.