Nevus is a vascular malformation that is often present at birth or as a child. Previous techniques such as freezing, isotope or plastic surgery will leave obvious scars and pigmentation while removing the blood vessels, which are now gradually not being used in mainstream hospitals for the treatment of blood vessels. The treatment of nevus is still preferred by pulsed dye laser, of which 595nm is the latest type, and the overall effect is the best and safest, but only about 1/4 of patients can be cleared. Therefore, Cynosure has developed a dual wavelength sequential emission laser platform, mainly with the addition of a 1060nm Nd:YAG laser, to improve the efficacy. From the current clinical experience it is difficult to say how much better than simply using the 595nm pulsed dye laser, after all, the 1060nm Nd:YAG laser is prone to scarring, and due to certain design reasons (such as inefficient cooling system, etc.) and suitable treatment parameters to be explored (based on my experience is estimated to be difficult to figure out), the device efficacy may need more observation, may only belong to The perception is good. However, the sequential emission technology of the device is good to avoid the side effects of the previous 1060nm Nd:YAG laser which is particularly likely to leave obvious scars, and is much safer than simply using the 595nm pulsed dye laser + 1060nm Nd:YAG laser. Photodynamic is a technology unique to our country, because the technology has greater side effects on the body, easily causing heart and liver damage, of course, the current observation found that as long as the corresponding indicators change that immediately stop treatment can basically return to normal (unfortunately, few hospitals do so now), which is more dangerous for patients who have their own primary heart and liver disease. At present, the new photosensitizer has been through several clinical trials, side effects have improved, but so far, there is no intravenous photosensitizer (for the treatment of blood vessels) has been approved by the state and allowed to be used in the clinic. In terms of overall efficacy, no substantial improvement over the 595 nm pulsed dye laser has actually been observed for the time being, except for a little better performance in targeting thick, deep vessels. Therefore, to remind, although photodynamic has been used in China for many years, it is best to wait for the national approval of the application of clinical photosensitizers on the market, pay close attention to the corresponding test indicators to receive treatment is better, after all, beauty second, safety first. Therefore, the current efficacy and safety comparison is definitely 595nm pulsed dye laser (cooling system is very important); dual wavelength should try, may improve the efficacy, but at present is not ideal; photodynamic should be ineffective in the laser, bear certain physical risks and then consider the treatment, of course, but also the use of regular and approved by the state photosensitizer, otherwise things do not know how to to defend their rights! At present, there is no method that can 100% cure the effect of vivid nevus, only after the operation can we know the exact effect of treatment.