Birthmarks are common. Research shows that about 10% of babies are born with a type of birthmark known as a hemangioma (he-man-gio-ma). Vascular malformations are benign (non-cancerous) lesions, are present at birth and grow with the child. They do not have a rapid growth cycle and then suddenly stop growing, they continue to slowly grow throughout life. Birthmarks vary in size and can range in color from brown to blue to shades of red or pink. Although in some children a birthmark is a minor flaw that they can live with, some children with a birthmark will require treatment.