Yellow tumors are not cancer. Xanthomas are not cancers, but rather hereditary lipid deposition disorders. The cause of xanthomas is not well understood, and the patients are mainly children under 10 years of age. Pathologically, xanthomas are characterized by granulomatous lesions that invade the viscera, pleura, skin, lymph nodes, pericardium, and bones, especially the membranous bones of the head. It may cause the patient to present with typical clinical manifestations of the case such as digitiform cranial defects, protruding eyeballs, or urolithiasis, and may also be characterized by developmental disorders, skin rashes, discoloration, gingival ulcers, and low-grade fever. Yellow tumors can be diagnosed by x-ray examination, etc., and will show typical map-like defects on flat film of the skull, single or multiple, with varying ranges of size. If the diagnosis is confirmed, radiotherapy, surgery and medication should be performed under the supervision of a doctor.