Laser can remove it, but it takes time and requires several sessions. Each session will fade a little bit, so take your time. When I went to the Air Force General Hospital in Beijing to get photon treatment, I met someone who had a blue birthmark removed on his face. He said he had been doing it for a year and it was effective but slow. Because each laser treatment takes about a week!
The cost of each treatment at the Air Force General Hospital is more expensive than other beauty salons. I don’t know the specific amount now.
You can also ask about the plastic surgery hospital of the Chinese Academy of Medical Sciences, located near Badachu in Beijing.