What are the possible side effects after Infini RF micro needling treatment with high fluence and long time exposure settings.

We’ve seen very nice results from
microneedling for acne scars.
In my practice, we use the SkinPen™ for microneedling, and the final outcome
for acne scars can be very impressive. One of the benefits of microneedling in
general is the minimal risk of side effects, particularly if you visit a board
certified plastic surgeon who is well-versed in the technique. However, since
the procedure does involve creating controlled micro-injuries to promote the
skin’s natural healing response, it’s common to notice redness and swelling
after a session. Some people may experience a mild acne flare-up, or tiny white
bumps under the skin called milia. Any of these concerns should dissipate
rapidly.

As Dr Rapaport explained, the high energies cause the tissue around the needles to dessicate around the needle and prevents further spread of the heat. So, actually the low energy, long pulse durations turn out to give the largest coagulation zones, more aggressive treatments. There is no harm in doing this and I have played with all the different settings to try to come up with the best ones. This very phenomenon actually contributes to the safety of the device, acting as a "safety valve" so to speak.