Infini RF settings for the face, why did she do 2.0mm on my cheeks and no 2.5mm?

This is difficult to answer without pictures. Infini is a popular treatment, but I prefer Intensif because the needles are non-insulated and give more robust results. For scarring, a combination approach will give the most improvement. I recommend a combination of lasers, microneedling/prp, subcision and fillers. It will take a series of treatments and may need some treatments to maintain. I recommend getting a formal evaluation with an acne scarring expert. Best, Dr. Emer

Whether the pass is 2.5 or 2 doesn't give more or less collagen stimulation. I don't know the reason for this unless the operator felt that the skin wasn't as thick in this area. Also, this is an area of more discomfort and he/she might of felt that more shallow would be more comfortable. Does it make any difference in the results?  Probably not, unless the scars are very thick in this area. There is one comment that states that the Intensif is more robust than the Infini because of uninsulated needles. I disagree. The energy must be less with uninsulated needles so as not to cause pigmentation problems or scarring. The Infini can deliver far more energy than most or all RF needling devices because of the insulation. In fact, it can deliver more energy than the skin can tolerate (with my research) if settings are tweaked. If the doctor desires uncoated needles with the Infini, the needles can be set at 0.5mm and get similar effects to the skin as Intensif. This is done at very light settings in light skin for superficial wrinkles and scars, in very select patients.

Each patient is individualized as far as settings. I cannot comment on the settings that were used in your case. I would advise you speaking with your doctor about why these settings were used.