Infantile hemangiomas are 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, depending on the hemangioma type, 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.

Ulceration occurs in about 5% of hemangiomas and can occur at any location. Ulcerated hemangiomas are painful regardless of location, often become secondarily infected, and leave a scar. Bleeding and ulceration can incorrectly cause or increase concern for possible physical abuse; however, their characteristic development in early infancy and typical regression should help differentiate them from the former. Ulceration is of particular concern when it involves the periocular, nasal, perioral, or anogenital areas, given regional risk for severe complication. Periocular ulceration and attendant scarring can distort the eyelids, scar the cornea, and/or affect development of binocular vision. Ulceration of the nasal or laryngeal areas can cause respiratory compromise. Perioral ulceration can interfere with latching and feeding.

Segmental infantile hemangiomas raise concern for regional abnormalities. A segmental infantile hemangioma of the upper face, ears, and/or scalp requires evaluation for PHACE syndrome (posterior fossa anomalies, hemangioma, arterial anomalies, cardiac anomalies, and eye anomalies). Involvement of the lower face and neck warrant assessment for laryngeal involvement.