Acupuncture. does not cause scarring if done properly. The needles are not put in very deeply. Peace and good health.
No. The diameter of needles is very small and will not cause scarring. Even with gua sha (korean scraping) and cupping the bruising will resolved and should not lead to scars. There is a specific procedure called "scarring moxibustion" which can cause a scar. I don't use it my practice.
No. No, not if it is done right.