Oral and maxillofacial growth of a bag may be caused by ectopic eruption of teeth, lymph node hyperplasia, mandibular tumors and other reasons. 1. Ectopic eruption of teeth: Ectopic eruption of teeth in the lower jaw, such as blocked teeth or supernumerary teeth, may lead to the emergence of oral and maxillofacial growth of a bag. 2. Lymph node hyperplasia: the lymph nodes in the oral and maxillofacial region are rich in lymph nodes, and lymph node hyperplasia may lead to the emergence of oral and maxillofacial growth of a bag, and the bag is not painless and itchy. 3. Mandibular tumor: enamel cell tumor, keratoacanthocyst and other mandibular tumors lead to the appearance of mandibular bone progressive expansion, and the appearance of oral and maxillofacial growth of a bag. Acute or chronic lymphadenitis, schistosomiasis, pulmonary schistosomiasis and other causes can also lead to the emergence of oral and maxillofacial growth of a bag, it is recommended that the patient promptly consult a doctor under the guidance of a clear diagnosis, targeted treatment.