What is the maxium number of sessions for RF microneedling for acne scar?

There is no correlation between cancer and microneedling. It can be variable how many sessions are needed to improve acne scars. A combination approach is best with microneeedling combined with prp, lasers, subcision and fillers. Usually a series is needed and some treatments may be needed to maintain. I recommend getting a formal evaluation with an acne scarring expert. Best, Dr. Emer

There is no maximum number of sessions, and no correlation to cancer or malignancy.  Acne scars can be difficult, and may require multi-modality treatment to achieve results.  11 sessions is quite a few, and if not getting the results you expect I would consider other options.  Some of the systems do not go as deep or are as aggressive as others - (depth of needles).  You may also need subscision, fillers, and laser resurfacing to get better overall results.
Best of luck,
Dr. Powell