This document discusses hemangiomas, which are noncancerous growths caused by abnormal blood vessel formation. Hemangiomas most often develop before birth on the skin or internal organs. The document covers what hemangiomas are, how they develop, where they can grow, types of hemangiomas, symptoms, diagnosis, and treatment options. Common treatments include anti-inflammatory medications, laser treatment, surgery, or watchful waiting, depending on the size and location of the hemangioma.