Whether the surface of the swelling is smooth or not can not be used as the basis for judging the tumor. A large number of clinical observations show that the smooth surface of the swelling is less likely to be a malignant tumor, and should be a benign tumor. In addition, benign tumors have the characteristics of slow growth, long duration of disease, clear boundaries of the mass, good mobility, etc., which can be judged comprehensively. On the contrary, if it is a malignant tumor, the aggressiveness of the tumor is relatively high, and the metastasis of distant organs, such as lungs, bones, and other parts of the body occurs abnormally, and there will be local lymph node enlargement and so on. When the swelling is found, the patient should consult a specialist and undergo ultrasound, relevant laboratory tests and tissue biopsy of the swelling in order to clarify the benign or malignant nature of the swelling.