Dark circle is caused by overdoing on the same spot. You have to

after you finish one laser shot (about 90 micro laser drilling). However, if you hapen to have dark circle, it usually goes away in several months. To speed up diminishing the dark circle, you can try to use 磨砂膏 to agitate skin's 新陳代謝，it will goes away. This is how I got rid of dark circle. Honestly, do not over do it at one spot....