The most common red birthmarks in babies are two diseases, one is nevus erythematosus, also known as wine-colored nevus, and the other is hemangioma. The manifestations of these two diseases are different, nevus erythematosus is flat on the skin, present at birth and will gradually worsen with age. Hemangiomas are not present at birth, but appear gradually as babies get older and become larger and larger, protruding from the skin and resembling strawberries, which is why they are also called strawberry hemangiomas. For both kinds of red birthmarks, the most important treatment method is to use pulsed dye laser, most of the results are very good, and it is recommended to be treated early.