Port wine nevus is a very common disease in hemangioma. Birthmark caused by vascular malformation, commonly known as "red birthmark", usually occurs in the face, neck and other places, which will increase proportionally with the passage of time, but generally will not fade by itself. Mild symptoms will only affect the appearance, which is a lifelong disease. Once found, it is best to treat it in time, which will seriously affect the appearance and life treatment, easily cause mental injury and form inferiority complex. It is easy to bleed after taking the initiative. At present, the best treatment is laser surgery.