Best Doctor for Dermal Fillers?

The specialty does not matter as much as the training and experience of the individual doctor. You should ask around and find out from friends etc someone who is known to be good. Also, you can use numbing cream before you go for injections and that would avoid any need for nerve blocks.
Click below on a link for information and then 'Botox and Filler Instructions' on how to prepare for filller injections.
Regards

There are many specialties that cross the spectrum of what we call 'Cosmetic surgery' and some are better at some things than others. Anatomy should cut across all specialties, but keep in mind that knowing anatomy doesn't translate into doing a good job in injecting or numbing.
In fact, you can know a whole lot and do a lousy job of getting a patient numbed. Having said that, I would hope that the more educated a physician, the better job overall they would do.
In our office, we don't even find the need for nerve blocks as I add the injection medicine to the syringe of filler and use a super potent topical numbing medicine along with a very slow and steady technique. Usually, our patients who have done blocks in other offices or ours before we developed this technique ask to NEVER get a block again.
So, you see, there are many things to consider here. One other, by the way, is that you should always insist that the doctor do the injecting. If they are farming it out to a nurse or PA, stay away! Good luck.

Your question is a politically loaded one, and so you will get a variety of answers. First, I am sorry to hear that you had difficulty after the nerve blocks, but it is unlikely to be related to the specialty-specific training that your doctor had; in order to "hit" the nerve, he had to know where it was and of course that is where the block needs to be placed. Complications from nerve blocks are extremely rare. Secondly, there are a variety of clinicians who are skilled at injecting. I supervise several RN injectors who do it all day every day and so their experience is vastly greater than many of the doctors who assert that only MD's should inject. It comes down to dedication to the art of aesthetic medicine more than the specialty background.