Hemangioma is the most common type of vascular malformation, also known as a birthmark. It is a benign tumor that originates from residual embryonic angiogenic cells and is formed by the proliferation of angiogenic cells during embryonic life. It is most often seen at birth or shortly after birth. The incidence is about 4-10% and is usually more common in girls, about 3-5 times more than in boys. The incidence is higher in premature low birth weight infants (less than 1 kg at birth) and in twins. Hemangiomas can occur throughout the body, and those occurring in the oral and maxillofacial region account for 60% of all hemangiomas, followed by the trunk (25%) and extremities (15%). Most of them occur in the facial skin, subcutaneous tissues and oral mucosa, such as the tongue, lips and floor of the mouth, while a few occur in the jawbone or deeper tissues. The appearance of hemangiomas depends on many factors, including whether they are superficial or deep, whether they are proliferative, stable or receding, and whether they are found at birth or after birth. Hemangiomas under the skin are called deep hemangiomas and appear as bruises or light blue, some of which are not visible at all. This type of hemangioma is usually detected when the baby is 2-4 months old. Sixty to 70 percent of hemangiomas may resolve by age 8 years. If a hemangioma is found on the surface of the skin, it can be seen at a regular hospital in plastic surgery or vascular surgery.