Thank you for your question and for sharing your photographs. I do see some subtle asymmetry between your right and left upper lip which can be improved with appropriate filler placement. As far as injectors, I would recommend seeking out an experienced, board-certified plastic surgeon or dermatologist in your area with whom you feel comfortable and who understands your desired results.
The best physician to do these injections is the one who has years of experience with facial injections. Most cosmetic dermatologists inject every single day, all day long, and are expert at the artistry of these facial injections. Best, Dr. Green
It sounds as if you were satisfied, but not completely satisfied with your last injector. If in doubt, seek the opinion of a Facial Plastic Surgeon, Plastic Surgeon, or another Dermatologist. All three specialties are trained to perform fillers and each specialty has great and not-so-great injectors. Lastly, it is very possible that you had some pre-existing asymmetry which should be reviewable on your pre-procedure photos.
I would go to a plastic surgeon, You should start out with maybe 1cc and go from there. You do not want to overdo too much filler in the lips. It also depends on the look you are going for too. You can always add more filler to the lips if needed. Just remember if you are going to do your lips and you do not want to bruise you should not take any aspirins or anything that will thin the blood since brusing can occur
The experience of the physician and aesthetic skill is more important than their credential. Both plastic surgeon and dermatologists perform injections. Seek out the physician injector that has the largest catalog of beautiful before and after results and the injector that is passionate about injecting fillers to create beautiful lips. I hope this information is helpful for you.
Stephen Weber MD, FACS
Denver Facial Plastic Surgeon