Definition A hemangioma is an abnormal buildup of blood vessels in the skin or internal organs. 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. 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. A liver hemangioma (he-man-jee-O-muh) is a noncancerous mass in the liver made up of a tangle of blood vessels. Liver hemangiomas are sometimes called hepatic hemangiomas or cavernous hemangiomas. 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. 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 spinal hemangioma is a noncancerous tumor that grows on your spine. It usually doesn’t cause symptoms or need treatment. 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. Hemangiomas are a type of growth that can appear as red or purple lumps on lighter skin or brown on darker skin. They happen when clusters of blood vessels grow and bunch together incorrectly. You can have them when you’re born, develop them during infancy or have them appear later in life. Know about the hemangioma types, symptoms, causes and treatment. Learn about the diagnosis and lifestyle tips for hemangioma and more.