The causes of red patches on the head of newborns include bright red nevus, hemangioma, etc. The treatments involved include laser treatment, medication such as glucocorticoids, and surgery. 1. Nevus erythematosus: nevus erythematosus is caused by developmental deformity of capillaries, which can be accompanied at birth, and it occurs on the face. The main clinical symptom is a light red or light blue patch, and the color fades when pressed hard. Laser is the main method to treat nevus erythematosus, and cryotherapy and injection of sclerosing agent are also available. 2. Hemangioma: hemangioma is mainly the abnormal proliferation of vascular endothelial cells, infantile hemangioma generally belongs to benign hemangioma, which is mainly manifested as congestive skin patches. Commonly used medication includes propranolol ointment, prednisone, etc. When conservative treatment is ineffective, it can be treated by surgical excision. When the patient is not feeling well, he should go to the hospital immediately. The above medications should be used under the guidance of a doctor.