The hazards of hemangiomas include: First, they impact appearance. Most hemangiomas are located on the head and face, severely affecting one's appearance and causing great physical and emotional harm to both the patient and their family. Second, they affect function by invading surrounding tissues and impairing the normal functions of nearby organs. Third, the tumor can bleed, and severe bleeding may lead to hemorrhagic shock. Fourth, abnormal development, as the tumor compresses surrounding normal tissues, can lead to developmental disorders, affecting bone growth and causing severe deformities in limbs. Fifth, ulceration can occur when the hemangioma grows too quickly or due to friction, leading to ulcers and infections, and potentially malignant changes. Therefore, hemangiomas can be quite dangerous.