Birthmarks can generally be divided into pigment type and vascular type. The common pigment types are nevus OTA, congenital pigmented nevus, coffee spot and so on. Vascular types include port wine nevus and strawberry hemangioma. Birthmarks can be found at birth or gradually formed several months after birth.

The incidence of neonatal birthmarks is about 10%, which can be said to be very common. Most birthmarks only affect the appearance and do not need special treatment. However, some birthmarks may be combined with abnormalities of body organs, and even have the possibility of malignant transformation, which must be actively treated.