Hemangioma is the most common vascular disease in children. Should we treat it aggressively or wait and see? This is a question that parents and even doctors struggle with. To answer this question, we first need to understand hemangioma: first we need to determine whether a mass is a hemangioma or a vascular malformation, superficial or deep, mixed? Is it a naturally regressing type or a rapidly proliferating type? Then we can decide whether to observe or treat it. For example, it can cause the risk of vision loss around the eyes, deformity of the five senses in the mouth and nose, and anal stenosis in the perianal area, which must be treated actively; on the contrary, it is less harmful in the limbs and trunk. What will happen to it? Is it in the growth phase or the receding phase? If it is already in the receding stage and gradually decreases in size, there is no need for active treatment; if it grows rapidly and infiltrates significantly, then active treatment is required. If the growth is rapid and the infiltration is obvious, active treatment is needed. Then there are children who have formed ulcers, or huge type of tumors, some syndromes, need active treatment. In conclusion: Hemangioma needs to be clinically evaluated as early as possible, based on a combination of site, developmental trend, and degree of harm.