Laser is different from photon. Laser is light with a single wavelength, while photon is intense pulsed light with a certain wavelength, that is, laser is monochromatic light, while photon is composite color light. A while ago, my friends and I went to the plastic surgery hospital to do color lighting and asked about birthmarks. Director Yao Wenhua there said that the birthmark depends on what kind of birthmark it is, and the correct treatment plan can be determined after the correct diagnosis. Generally, nevus OTA and coffee spot are treated by laser, and vascular red birthmark is more troublesome. You'd better go to a professional hospital.