Although many units are conducting clinical work on laser treatment of hemangiomas, the value of laser treatment for infantile hemangiomas is actually very limited. This is because laser is a physical therapy, and for hemangiomas in the proliferative phase, laser treatment alone cannot control the continued growth of hemangiomas. Secondly, the penetration depth of laser is limited, and it is not effective for deep (subcutaneous) hemangiomas. If the power is increased, regrettable scarring and pigment changes are often left behind. Therefore, laser treatment of hemangioma is limited to superficial skin hemangiomas that have stopped growing and are less than 2 mm thick.