I suggest that it can be lit all the time! ! ! Of course, the follow-up maintenance after polishing is also very important, so we must strengthen sun protection. I have used this method for 2~3 months, and I have made a lot of progress! I happened to be on a business trip in Taiwan Province Province at that time, and I was recommended by a friend to see a doctor, Liao, an authoritative micro plastic surgeon in Taipei East District. He recommended me, of course I did. Three months later, I went to see Dr. Ethan, and sure enough, things were different. You can try. Dr Ethan has published a book! Can refer to it