1, check the first change, it's very simple, you only do one side (the other side doesn't do it), and you can see it by comparison.

2, the arm appears red, which is the effect of traditional scraping (people with scraping experience will understand)

3. It is recommended to do it once a day until you are satisfied, and the effect is the best.

4. It seems unnecessary to think about this question. SPA instrument is an imported instrument. How can it be effective without gel?

I hope this helps.