OK, most of us would use RF at a conservative depth, depending on the area targeted. 2-3 mm, fat lies deeper in most areas, however on your forehead for example, I normally would use a 0.5 mm setting.
Now here is the catch- if someone does not know what they are doing, and uses the 5 mm needle with hight energy levels (about to be launched in Australia) and triple or quadruple pulses in the same area on the cheek in someone who is fat depleted already, it may cause loss. In theory. Best thing to do is to see an expert in this procedure. All the best, Dr Davin S. Lim. Brisbane. Australia.