Hi, Thanks for writing in. A cancer diagnosis requires detailed evaluation and confirmation. The final diagnosis is made only after a biopsy. A biopsy involves studying the cells under a microscope by the pathologist and confirming them to be cancer. A cancer cell is one that multiplies without control and in an irregular fashion. This can be seen under microscope. Cancer cells are also of many grades like low grade, intermediate grade and high grade depending on the aggressiveness. A low grade cancer has better curability than a high grade. These will be known after the biopsy test. During surgery a small area of normal appearing skin is also taken out to make sure no cancer tissue is left behind. However, in high grade cancer the cells can re appear and this needs to be closely observed. Therefore if high grade cancer cell is seen on biopsy then additional treatment like chemotherapy and radiation is also given. Recurrence chances of cancer is more with a higher grade of tumor. If there is recurrence of squamous cell cancer then more aggressive surgery, chemotherapy and radiation might be required. Please do not worry.