A lesion is a lesion that occurs on the organism, and lesions include nasty lesions and benign lesions, etc. Cancer is a malignant lesion originating from epithelial cells, which is invasive and can metastasize to distant places. Focal lesions are swellings or nodules that cannot be determined to be benign or malignant, and it is necessary to take part of the tissue for pathological examination to clarify the nature of the lesion. Benign foci are usually expansive, slow-growing and not invasive. Malignant masses include not only carcinomas, but also sarcomas that originate in mesenchymal tissue. Carcinoma is a malignant neoplastic disease originating from epithelial cells, which has the characteristics of unlimited proliferation and metastatic infiltration to distant places, and progresses more rapidly and can be life-threatening if not actively treated. There is a big difference between lesion and cancer. If you feel unwell, it is recommended to go to the hospital for a clear diagnosis and treatment so as not to delay your condition.