Hemangioma

Infantile hemangioma is a benign neoplasm that commonly develops in neonates within their first few months of life. These birthmarks are more common in Caucasians, and girls are three to five times more likely than boys to have a hemangioma. Most infantile hemangiomas undergo rapid initial growth, with a plateau in growth at age 9-10 months, then begin to resolve. The involuting phase extends from 1 year until 5 to 10 years of age. 

Whether hemangiomas need to be treated or not is a subject of controversy because most hemangiomas resolve in time without treatment.