In September 2023, Goldman et al. published a communication in Dermatologic Surgery describing their use of subcutaneous sodium deoxycholate injection (SDOC), with or without triamcinolone acetonide, for reduction of submental fat..
As they note, “patients experience a variable degree of edema and discomfort following subcutaneous injection,” of SDOC, something that I and others have also observed in our practices.
Dr. Naissan O. Wesley
In their double-blind study of 20 patients with a baseline Clinician-Reported Submental Fat Rating Scale of 2 or 3 out of 4, 5 patients were randomized to receive SDOC as recommended in the label, while 15 received SDOC plus triamcinolone. In the latter group, 2 mL of SDOC was mixed with 0.5 mL of 40 mg/mL of triamcinolone acetate, then administered in up to 50 injections in the submentum spaced 1.0 cm apart at 0.25 mL per injection. Three treatments were administered 1 month apart.
For both groups, volumes between 5 mL and 8 mL per treatment were delivered. There were no significant differences in efficacy 30, 60, and 90 days after the final injection between the two groups. However, at day 180, the group that received only SDOC had a significantly greater reduction in submental fat, which the authors wrote indicated that the addition of triamcinolone “may mildly diminish the fat reduction effects” at that time point.
Subcutaneous SDOC (deoxycholic acid) injections for reduction of submental fullness was approved by the Food and Drug Administration in 2015 for improving the appearance of moderate to severe convexity or fullness associated with submental fat in adults. (I was involved in the clinical trials.) We found that in the trial, for optimal efficacy, most patients require two to four treatments spread at least a month apart, with patients who had larger treatment areas requiring up to six treatments.
While the clinical trial treatments were spaced 4 weeks apart, post approval, we found that patients would sometimes report further efficacy even 2-3 months post injection. Since not everyone wants to go around with edema every month for 2-4 consecutive months, spacing the treatments farther apart allows patients more time to heal and coordinate the recovery appearance around their work and social schedules.
In my practice, very rarely have we seen minimal to moderate prolonged edema, particularly in younger patients, beyond 1 month post injection. Most people have the most noticeable edema — the “bull-frog” appearance — for the first 1-3 days, with some minor fullness that appears to be almost back to baseline at 1 week. In some of these patients with prolonged submental fullness, it looks fuller than it appeared pretreatment even months afterwards.
While rare, like the study authors, I have found intralesional triamcinolone to be helpful at reducing this persistent fullness should it occur. It is likely to be reducing any persistent inflammation or posttreatment fibrosis in these patients.
Unlike the study authors, I do not combine SDOC and triamcinolone injections at the time of treatment. Rather, I consider injecting triamcinolone if submental fullness is greater than at baseline or edema persists after SDOC treatment. It is rare that I’ve had to do this, as most cases self-resolve, but I have used triamcinolone 10 mg/mL, up to 1cc total, injected 6-8 weeks apart one to three times to the affected area and found it to be effective if fullness has persisted beyond 6 months. Liposuction may also be an option, if needed, if fullness/edema persists.
Overall, SDOC is an effective treatment for small pockets of subcutaneous fat. Approved for submental fullness, it is now sometimes used off-label for other parts of the body, such as bra fat, small pockets of the abdomen, and lipomas. While some inflammation after treatment is expected — and desired — to achieve an effective outcome of fat apoptosis, intralesional triamcinolone is an interesting tool to utilize should inflammation or posttreatment fullness persist.
Dr. Wesley practices dermatology in Beverly Hills, California. Write to her at dermnews@mdedge.com. She was an investigator in clinical trials of Kybella.