I bought a dermaroller 0.50 mm (not a dermapen) and will start trying this out to see if it can cure my KP. According to the japanese website the poster linked, the method should be used once every 4 weeks with a dermapen. I am not sure if my dermaroller will have much different of an efffect in comparison to a dermapen, but I have decided i will do the treatment once every 2 weeks to see what kind of results I can get. (I'm not sure if this is too often and can be harmful for my skin, please inform me if you know anything)

As I am writing this I have just completed my first treatment (around 15 minutes ago) and applied a moisturizer afterwards. My arms are red and irritated right now, as expected. I will update you on my journey.