A hemangioma on forehead may be related to abnormal vascular development in embryonic period, abnormal proliferation of vascular endothelial cells and other factors. Hemangioma, i.e. hemangioma, refers to tumors occurring from vascular tissues. Hemangiomas are benign, slow-growing and rarely malignant. It is mostly manifested as skin or subcutaneous elevation. Its occurrence is generally related to the following factors: 1. Abnormal vascular development in embryonic stage: in embryonic stage, if the vascular endothelial progenitor cells are detached from the developing vascular network, they proliferate locally to form endothelial cell strips and vascular lumens, which are fused with each other and gradually differentiate to form hemangiomas. 2. Abnormal proliferation of vascular endothelial cells: such as changes in the expression of cellular protease and extracellular matrix, and imbalance in the balance between angiogenic factors and inhibitory factors may lead to abnormal reproduction of vascular endothelial cells, thus forming hemangioma. Treatment of hemangiomas is determined by the type and location of the lesion and the age of the patient. Current treatments include shell resection, radiation therapy, hormone therapy, cryotherapy, laser therapy, sclerotherapy and so on. It is recommended that the patient go to the hospital in time and be given targeted treatment under the guidance of the doctor.