How many Pico Toning sessions do I need to see results?

I've become interested in Pico Toning because so many people are doing it these days, but I'm curious about how effective it actually is…

I'm looking into Pico Toning because of age-related melasma and blemishes, but I'm wondering how many sessions I should get.

I'm curious about the level of pain associated with Pico Toning, and I'm also confused because I heard the treatment cycle and recommended sessions vary from person to person.

I am particularly worried because the cost of Pico Toning varies significantly from clinic to clinic... I would like to hear reviews from those who have experience regarding side effects or cases where pigmentation becomes darker.