There are some nurses that have focused so much on injecting fillers, under the supervision of a doctor, that they develop better technique than the supervising doctor. These days, more doctors tend to do the injections. Fillers are not a cookie cutter treatment. There is an art and science to injecting fillers, and the technique improves with experience. Some injectors have a forceful hand and bruising and pain increase. Others are very gentle and give slow injections which can make it less painful and there might be less bruising as a result. These techniques can be learned by a nurse as readily as a doctor. Extremely reputable cosmetically-minded plastic surgeons have nurses performing these injections in their office and would not have them do it on their facelift patients if they were concerned that there would be a bad result. One disadvantage of having a nurse do the fillers is that if you really like his or her treatment, they might change jobs to a different office and you would have to look for a new injector if you can't find them. If you have a doctor do your injections and you like their treatment, then you could follow them to any practice to which they transfer. Theoretically, if there is a complication, which is extraordinarily rare, the physician might be more readily able to deal with and treat the unexpected problem.