A movable lump on your jawbone can have several causes, most of which are not serious. Common causes include swollen lymph nodes, allergies, fibromas, lipomas, cysts, abscessed teeth, and in rare cases, cancer. Swollen lymph nodes are often due to infections and may be accompanied by symptoms like fever or a runny nose. Allergies can also cause swelling in the lymph nodes and other facial areas. Fibromas and lipomas are benign growths that usually don't cause pain. Cysts are fluid-filled sacs that can sometimes become inflamed. An abscessed tooth is a bacterial infection that needs immediate dental treatment. Cancerous tumors are rare but can occur. Diagnosis typically involves physical examination, medical history, and possibly imaging tests like X-rays, CT scans, or MRIs. Treatment depends on the cause: infections may require antibiotics, allergies might be managed with antihistamines, and benign growths can be removed if they cause discomfort. In some cases, surgery may be necessary, especially if the lump is suspected to be cancerous or interferes with jaw function.