DefinitionA hemangioma is an abnormal buildup of blood vessels in the skin or internal organs.Alternative NamesCavernous hemangioma; Strawberry nevusCauses, incidence, and risk factorsAbout 30% of hemangiomas are present at birth. The rest appear in the first several months of life.The hemangioma may be:In the top skin layers (capillary hemangioma)Deeper in the skin (cavernous hemangioma)A mixture of bothSymptomsA red to reddish-purple, raised sore (lesion) on the skinA massive, raised tumor with blood vesselsMost hemangiomas are on the face and neck.Signs and testsHemangiomas are diagnosed by a physical examination. In the case of deep or mixed lesions, a CT or MRI scan may be performed.Occasionally, a hemangioma may occur with other rare conditions. Additional tests may be done for these