Infants born with red marks on the forehead may be caused by hemangioma, bright red nevus, capillary hemangioma and other causes. 1. Hemangioma: the etiology of hemangioma is still unclear, and it is considered to be related to the inhibition of angiogenic factors and mutation of disease-causing genes. Patients will have congestive plaque-like, strawberry-like plaque and other forms. If babies have hemangioma on forehead, there will be red marks locally. 2. Nevus erythematosus: the cause of nevus erythematosus is not yet clear, and it is considered to be related to neurological factors, vascular factors, heredity and other reasons. The patient’s lesion area will appear light red, dark red, and irregularly shaped patches. If infants are born with bright red nevus on forehead, it will be manifested as localized post red marks. Infants born with red marks on the forehead, there may also be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.