A hemangioma is a common vascular birthmark, made of extra blood vessels in the skin. It is a benign (non-cancerous) growth. Hemangiomas may occur anywhere on the body. There are three main types of hemangioma: superficial (on the surface of the skin), deep (under the skin) and mixed. A hemangioma (he-man-jee-O-muh), also known as an infantile hemangioma or hemangioma of infancy, is a bright red birthmark. It looks like a rubbery bump or flat red patch and is made up of extra blood vessels in the skin. The mark shows up at birth or in the first month of life. Hemangiomas are benign tumors made of extra blood vessels that cluster together in a dense, tangled mass. They’re the most common vascular tumors in infants, appearing in roughly 4.5% of babies, but they also occur in adults in different forms. What you can expect from a hemangioma depends on the type, where it is and when you have it. In general, hemangiomas aren’t dangerous unless they grow in certain places. A hemangioma is a benign (noncancerous) tumor made up of blood vessels. There are many types of hemangiomas, and they can occur throughout the body, including in skin, muscle, bone, and internal organs. Most hemangiomas occur on the surface of the skin or just beneath it. Definition A hemangioma is an abnormal buildup of blood vessels in the skin or internal organs. A hemangioma or haemangioma is a usually benign vascular tumor derived from blood vessel cell types. The most common form, seen in infants, is an infantile hemangioma, known colloquially as a strawberry mark , most commonly presenting on the skin at birth or in the first weeks of life. A hemangioma is a type of birthmark and vascular abnormality and is the most common benign (noncancerous) tumor of the skin. Port-wine stains, strawberry hemangiomas and salmon patches are all hemangiomas. While they may be very faint or invisible at birth, most hemangiomas grow rapidly after birth. Know about the hemangioma types, symptoms, causes and treatment. Learn about the diagnosis and lifestyle tips for hemangioma and more. Hemangiomas are benign (non-cancerous) vascular growths that form due to an overgrowth of blood vessels. They are the most common benign tumor found in infants and are often called “strawberry marks” due to their appearance.