Hemangioma is a benign tumor, mostly in infants and young children, commonly found on the head and face, tongue in the mouth, trunk, limbs and other parts of the body, causing serious impact on the normal life of the majority of children and parents! Only after understanding the different types of hemangioma can we provide direction for choosing a better treatment method. At present, the common classification methods of hemangioma are mainly as follows: Zhao Fuyun, Department of Laser Aesthetic Plastic Surgery, Peking University Stomatological Hospital Classification I. Morphological classification: It is a classification method based on histological structure and clinical signs. It classifies hemangioma into capillary hemangioma (nevus and strawberry hemangioma), cavernous hemangioma, trabecular hemangioma and mixed hemangioma, etc. This classification method is still used in most textbooks. (1) Capillary hemangioma: Mostly seen in infancy and early childhood, occurring in superficial parts of the face and oral mucosa. They are composed of proliferating capillaries, most commonly strawberry-shaped, slightly above the surface, bright red or purple-red in color, with clear borders, called strawberry-shaped capillary hemangioma. If it does not rise above the surface, it is a large flat red spot and can be receded by pressure, then it is called wine spot (erythema nevus). (2) Spongiform hemangioma: It is found in the deep part of the face and oral mucosa and consists of enlarged venous ducts or sinus cavities. The lesion is elevated on the surface of skin or mucous membrane and expands to deeper tissues. The lesion is greenish-blue in color, irregular in shape, uneven on the surface, soft like sponge, and can shrink when pressed, and regains its original shape immediately after pressure is removed, and increases when the head is low. Hard nodular venous stones can be felt and blood can be extracted by puncture. It can involve the jaw bone and affect the facial appearance, causing facial deformity and dysfunction. (3) Trapezoid hemangioma: It is a vascular malformation with direct communication between arteries and veins. The dilated blood vessels under the skin of the lesion area are trapezoidal and tortuous, with obvious pulsation and tremor, and there can be blowing murmur on auscultation, and the surface skin is dark red. (4) Mixed hemangioma: Mixed hemangioma consists of simple hemangioma and cavernous hemangioma, and the clinical manifestations are the same as the above two types of hemangiomas. Classification II. Cytological classification (new classification method): Mulliken divided traditional hemangioma into two categories: hemangioma and vascular malformation by culturing specimens of vascular endothelial cells in hemangioma in 1982 and found that they have the dual characteristics of tumor and malformation. Hemangioma: It is characterized by the proliferation of vascular endothelial cells and the formation of a large number of new capillaries, with clinical manifestations of strawberry hemangioma, cavernous capillary hemangioma and mixed hemangioma. Pathogenesis: It may be caused by increased level of pro-angiogenic factors and decreased level of growth inhibitory factors. Vascular malformation: It is a developmental malformation of the vascular system, mainly blood vessels, while the vascular endothelium is normal. They are further classified according to anatomical and blood rheological features: low-flow vascular malformations include capillary malformations, venous malformations and lymphatic malformations; high-flow vascular malformations include arteriovenous malformations, arteriovenous malformations and arteriovenous fistulas.