ABSTRACT: There are 2 principal types of benign vascular tumors—hemangiomas—commonly seen in infants. Infantile hemangiomas, which are the most common, usually appear 2 to 3 weeks after birth, grow rapidly over the next 6 months, then begin to involute. Most infantile hemangiomas involute completely by the time a child is 9 or 10 years old. Congenital hemangiomas, as their name implies, are present and fully developed at birth. Some congenital hemangiomas involute rapidly over the first year of life; other congenital hemangiomas are noninvoluting.