1. chemical factors: it may be that long-term exposure to some chemicals leads to hair loss variation and tumor formation.
2. Physical factors: such as ionizing radiation and ultraviolet rays. Foreign body stimulation can induce the occurrence of tumors.
3. Genetic factors: the tumor has a family genetic tendency. If a family member has a tumor, the child's general risk of developing a tumor is higher than others. Generally, regular physical examination is needed to achieve early detection and early treatment.
In addition, it may also be caused by virus infection, aging population, tumor susceptibility and other factors, which can be treated according to the cause.