A hemangioma is a benign (noncancerous) tumor made up of blood vessels. A hemangioma occurs when small blood vessels begin to multiply at an abnormal rate and form a mass or lump. Some hemangiomas may develop after injury. There are several types of hemangiomas, and they can occur throughout the body, including in skin, muscle, and bone. Most hemangiomas occur on the surface of the skin or just beneath it. They often develop on the face and neck, and can vary greatly…