The differences between inflammatory mass and tumor are: 1. The clinical manifestations are different. Inflammatory mass is usually caused by inflammatory infection, often accompanied by fever and pain, etc. If the mass is located on the body surface, it will also have obvious pain when touched, and the local skin may appear red, swollen and hot. Tumor masses, whether benign or malignant, generally do not show symptoms of fever and pain, tumor masses on the body surface will not have obvious pain when touched, and local skin will not appear red, while malignant tumor masses grow rapidly and can appear distant metastasis, inflammatory masses will definitely not appear distant metastasis. 2. The characteristics are obviously different in CT, MRI, chest X-ray and other imaging examination films, in The inflammatory masses in CT examination films are generally more regular in shape and clearly demarcated from surrounding tissues, and may show local lymph node enlargement, mainly due to inflammatory stimulation. Although benign tumor masses are also regular in shape and clearly demarcated from surrounding tissues, they will not have local lymph node enlargement, while malignant tumor masses may also have local lymph node enlargement, but they are generally irregular in shape and not clearly demarcated from surrounding tissues. 3. Different response to treatment, inflammatory masses can mostly subside rapidly after certain time of anti-inflammatory treatment, while tumor masses do not respond to anti-inflammatory treatment.