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I bought 1 MTS roller for $500. You can do it at home, DIY. I don't suggest you do it at beauty center, since the hygiene standard is not assured. I have tried to use it at home, it is very effective, easy and safe, and the roller can be used for more than 10 times, so very cheap each time, no need to go out and buy expensive treatment. Of course, you need to buy some equipments, like 生理鹽水, alochol, 面膜, 麻醉藥膏(如EMLA、Lidocane), growth factor, betadine... They are available at pharmacy, or I can help you buy them.
I got very serious acne marks before, but after a few treatment, now I am much better. There is significant improvement after each treatment. I started with 0.5mm, 1.0mm, then 1.5mm. I am using 1.5mm now, which is very effective for acne scar and pre-mature aging problem. I do it in the evening, and rest for a day at home.
The whole procedure is very simple. You can have a look at my blog.