The most common benign tumors of infancy, occurring in up to 10% of infants, with up to 50% involving the head and neck. Precursors may be present at birth, evolving into a more classic appearance within the first few months of life. Usually, infantile hemangiomas grow rapidly during the first few weeks of life. This initial proliferative phase typically peaks as early as 2 months of age. This is followed by a steady state lasting months followed by gradual involution over several years, with more than 90% completely involuting by age 10. Although infantile hemangiomas involute with time, residual skin changes such as telangiectasia, scarring, atrophy, and fibrosis persist in up to 30% of lesions after involution is complete.