If a dermatologist believes a mole needs to be evaluated further, he or she will do a biopsy by shaving or cutting out the entire spot so that it can be evaluated under the microscope. This is a simple procedure. (If the dermatologist thinks the mole might be cancerous, cutting through the mole will not cause the cancer to spread.)
If the mole is found to be cancerous, the dermatologist will cut out the entire mole or scar from the biopsy site by cutting out the entire area and a rim of normal skin around it, and stitching the wound closed.