Vascular nevi are generally referred to as hemangiomas and vascular malformations. Hemangioma is a tumor of vascular origin with abnormal proliferation of vascular endothelial cells; vascular malformation refers to a benign tumor caused by vascular dilatation due to developmental malformations of the vascular system. 1. Hemangioma: the specific pathogenesis of hemangioma has not been completely clarified, and it can also be considered to be related to congenital developmental defects. Hemangioma on the scalp, if occurring in infancy, is considered to be caused by abnormal proliferation of vascular endothelial cells during embryonic period. 2. Vascular malformation: it refers to the developmental malformation of the vascular system, the dilatation of vascular lumen, and the absence of abnormal proliferation of vascular endothelial cells. They are divided into capillary malformation, venous malformation, arterial malformation, arteriovenous fistula, arteriovenous malformation, lymphatic malformation and related syndromes. The most common is bright red nevus. It is recommended that infants and young children who are found to have bright red maculopapular rash or burgundy nodular growths on the body surface, rapid growth of growths, bleeding, ulcers or ulcers that do not heal in a long period of time should go to the general surgery department of the hospital, pediatrics, dermatology and venereal diseases department for timely medical consultation.