Vascular nevi are caused by embryonic vascular dysplasia and are generally divided into two types, one is hemangioma and the other is vascular malformation. Vascular nevus will appear as dark red or wine color on the body surface, and the surface of the nevus may be flat or slightly elevated with nodular thickening, and the cause is mainly related to the proliferation of vascular network during embryonic period. Generally speaking, vascular nevus may heal by itself. If it cannot heal by itself, it can be treated by medication, and then assisted by local treatment such as laser and freezing to relieve the symptoms, and if the above treatment is ineffective, it can also be treated by surgery to remove the vascular nevus. 1. Causes of hemangioma: it is mostly caused by abnormal proliferation of cells in the vascular endothelium, which may occur congenitally or later in life, and may increase the chance of occurrence of hemangioma if the patient has excessive secretion of sex hormones in the body. 2. It may be related to factors such as high maternal blood pressure, improper application of progesterone during pregnancy and local tissue injury in early embryonic period. Drug treatment: Drug treatment is mainly to shrink the blood vessels and make the vascular nevus subside, you can use glucocorticosteroid for treatment according to medical prescription, or use prednisone to slow down the development of the disease. For patients with poor treatment effect and long term non-resolution, the lesion can be removed by surgery to achieve the effect of cure.