Port wine stain is a common congenital, low blood flow intra-dermal vascular malformation. It is mostly present at birth and rarely fades on its own. It appears as a light red or pink rash that increases in size with age and may form nodules or bumps, and deepen in color to red or purple. It often occurs in exposed areas such as the face and neck, and is most common in the trigeminal nerve distribution area. Because the nevus often occurs in the exposed area, it may cause serious psychological stress to the patient and even affect the patient’s personality development. Moreover, it does not disappear with time and seriously affects the appearance of patients. Therefore, most scholars believe that the earlier the treatment of nevus is, the better (especially for those who develop faster), so as not to affect the character development of patients, and according to our experience, the treatment effect of younger patients is better than older ones. Of course, if the development of nevus is relatively slow, we can also choose to treat it at an appropriate period.